Surface Area of a Sphere. The Greek mathematician Archimedes discovered that the surface area of a sphere is the same as the lateral surface area of a cylinder having the same radius as the sphere and a height the length of the diameter of the sphere. The lateral surface area of the cylinder is 2πrh 2 π r h where h = 2r h = 2 r .Learn how to calculate the surface area of a sphere using the formula SA = 4 π r2 square units, where r is the radius of the sphere. Find out the difference between surface area and other types of surface areas, such as curved, lateral and total surface area. See solved examples and FAQs on surface area of a sphere. Updated for new NCERT - 2023-24 Exams. Get solutions of all exercise questions and examples of Chapter 11 Class 9 Surface Area and Volumes from the NCERT Book. All answers are solved in an easy way, with video of each and every question. You can also check the list of all Surface Area and Volume Formulas. Click on an exercise link, or a …The Volume and surface area formula for Sphere are as follows: Volume of a Sphere (V) = 4/3πr3. Surface Area of a Sphere (A) = 4πr2. Where, π is a mathematical constant approximately equal to 3.14159. r= Radius of the Sphere. The formulas for diameter, area and volume are given in the following table: Property.Find the Surface Area sphere (7cm) r = 7cm r = 7 cm. The surface area of a sphere is equal to 4 4 times Pi π π times the radius squared. 4π⋅(radius)2 4 π ⋅ ( r a d i u s) 2. Substitute the value of the radius r = 7 r = 7 into the formula to find the surface area of the sphere. Pi π π is approximately equal to 3.14 3.14.Surface area of a sphere. The surface area formula for a sphere is 4 x π x (diameter / 2) 2, where (diameter / 2) is the radius of the sphere (d = 2 x r), so another way to write it is 4 x π x radius 2. Visual on the figure below: The free sphere surface area calculator calculates: Radius of the sphere. Volume of the sphere. Surface Area of the sphere. Circumference of the sphere. No matter what parameter you select as your input, the radius of a sphere calculator will enumerate all of these parameters precisely. Also, the whole information is displayed in the form of a ... Surface area is a two-dimensional measurement that is the total area of all surfaces that bound a solid. The basic unit of area is the square unit. Surface Area of a Sphere: …Part 1. The surface area of a sphere of radius ‘r’ is given by: surface area = 4pr2. NOTE: The value of p can never be known exactly, so surface areas of spheres cannot be calculated exactly. Common approximations for p are: 3.14, and 22/7. Example 1 if ‘r’ = 5 for a given sphere, and p = 3.14, then the surface area of the sphere is:The free sphere surface area calculator calculates: Radius of the sphere. Volume of the sphere. Surface Area of the sphere. Circumference of the sphere. No matter what parameter you select as your input, the radius of a sphere calculator will enumerate all of these parameters precisely. Also, the whole information is displayed in the form of a ... The surface area of a sphere with radius 11 units can be calculated using the formula: Surface Area = 4πr². Substituting the given value of radius: Surface Area = 4π(11)². Surface Area = 4π(121) Surface Area = 484π. Approximating to two decimal places, the surface area is approximately 1520.53 units².A sphere is a set of points in three dimensions that are located at an equal distance r from a center point. Use this online calculator to calculate the surface area, volume, circumference and …Sony's Xplod subwoofers feature a unique pentagonal cone that provides a large surface area for high-performance bass output. Despite the pentagonal cone, the woofers are built int...Related Queries: body surface area, 172cm, 58kg; map projections; algebraic degree of sphere; moment of inertia tensor of solid of sphere; surface area of sphere The intersection of two spherical surfaces is a circle whose plane is perpendicular to the line joining the centers of the spheres and whose center is on that line. (See figure to the right.) A plane perpendicular to a radius at its extremity is tangent to the sphere. Formulas for a Sphere. Surface Area, A The surface area of a sphere is equal ...Radius, r =14 cm. By the formula, Surface area of a sphere = 4πr 2. On substitution, we get, SA = 4 x 3.14 x 14 x 14. = 2,461.76 cm 2. Example 2. The diameter of a baseball is 18 cm. Find the surface area of the ball. Solution. Summary: The area of the surface of a sphere = 4 π r 2 or π d 2 sq.units, where r is the radius and d is the diameter. The total surface area of the hemisphere = 3 π r 2 sq.units. Example: A solid is composed of a cylinder with hemisphere ends. If the whole length of the solid is 108cm and the diameter of the hemispherical ends is 36cm, find ...A sphere is a round-shaped object in three-dimensional space. All points on a sphere’s surface are the same distance from its center point. Some examples of a sphere are a globe, m...Formula for the surface area of sphere = 4πr 2 = 4×(22/7)×7 2 = 616. Surface area of a sphere is 616 cm 2 (ii) Radius (r) of sphere = 21/2 = 10.5 cm. Surface area of a sphere = 4πr 2 = 4×(22/7)×10.5 2 = 1386. Surface area of a sphere is 1386 cm 2. Therefore, the surface area of a sphere having a diameter 21 cm is 1386 cm 2 The uneven heating of the Earth’s surface is caused by the sun. This occurs because the Earth is a tilted sphere and the sun does not heat all its surfaces equally and because the ...The surface area of an arbitrary (n − 1)-sphere is proportional to the (n − 1) st power of the radius, and the volume of an arbitrary n-ball is proportional to the n th power of the radius. Graphs of volumes (V n) and surface areas (S n−1) of n-balls of radius 1. The 0-ball is sometimes defined as a single point.To find the radius of a sphere given its surface area, we can use the formula for the surface area of a sphere: Surface Area = 4πr^2. Given that the surface area is 7.84π ft², we can set up the equation as follows: 7.84π ft² = 4πr^2. Now, we can cancel out the common factor of π from both sides of the equation: 7.84 ft² = 4r^2.The new title registry for crypto wallets set to signal a complete paradigm shift in how institutions see cryptoLOS ANGELES, CA / ACCESSWIRE / Aug... The new title registry for cry...If you own an apartment complex, you know how hard it can be to keep things looking great. There’s plenty of surface area to cover when it comes to Expert Advice On Improving Your ...A sphere’s surface area is the total area that the sphere’s surface covers. It is measured in square units. A mathematical constant π has an approximate value of 3.14159. Key Concepts. The surface area of a sphere does not depend on its orientation in space.Brooklyn College explains that cells are small because they must have a large surface area relative to the amount of volume they contain to function properly. As a sphere grows lar...The formula for calculating the surface area of sphere is given by: SA = 4 × π × r2. SA = 4 × 3.14 × 112. SA = 1519.76. The surface area of sphere is 1519.76 cm2. Example 5: A hemisphere has the radius measured to 8.3 cm. Find the surface area of it without the base. Solution: r = 8.3 cm. WHAT YOU NEED: an orange, pencil and paper. The orange should be as round as possible, so the peel represents the surface area of a sphere. STEP 2: Repeat this 3 more times. You should now have 4 ...The surface area of a sphere is the area occupied by the curved surface of the sphere. Circular shapes take the shape of a sphere when observed as three-dimensional …What is the surface area of a sphere whose diameter is 22 centimeters? Bruce is making a sculpture in his art class that is made of 3 spheres. Each sphere has a radius of 2.3 feet. He will paint them all with blue poster paint. If each bottle of paint covers 20 square feet, ...Limitations of Sphere Surface Area Calculation Accuracy. Measurement Errors: Small errors in measuring the radius or diameter can result in significant errors in the calculated surface area. Surface Irregularities: The formula assumes a perfect sphere. Real-world objects may have surface irregularities that affect the calculation.Surface Integral over a sphere. Suppose f(x, y, z) = g( x2 +y2 +z2− −−−−−−−−−√) f ( x, y, z) = g ( x 2 + y 2 + z 2), where g g is a function of one variable such that g(2) = −5 g ( 2) = − 5. Evaluate. where S S is the sphere x2 +y2 +z2 = 4 x 2 + y 2 + z 2 = 4. Now, I reasoned as follows. If g(2) = −5 g ( 2) = − 5 ...This gives the expected results of 4 π steradians for the 3D sphere bounded by a surface of area 4πr 2 and 2 π radians for the 2D circle bounded by a circumference of length 2πr. It also gives the slightly less obvious 2 for the 1D case, in which the origin-centered 1D "sphere" is the interval [− r , r ] and this is bounded by two limiting points.The surface area of a sphere is the total area of its exposed surface. It can be calculated using the following formula: A = 4pir². where r is the radius of the sphere. For example, if the radius of a sphere is 3 inches, its surface area would be: A = 4pi (3 in)². A = 4pi (9 in²) A = 36 in². A = 113.1 in².The surface area of the sphere is given and we will have to figure out the volume of the same sphere. For your information, below is the formula to find the surface area of a sphere. [latex]\text{Surface Area of Sphere} = 4\pi {r^2}[/latex] It …Surface Area of Spheres. Drag the red point to see how a sphere can be dissected into n pyramids (approximate) of heights equal the radius r. Let A1, A2, ..., An be the base areas of the pyramids. (a) Show that 1/3 (A1+ A2 + ... + An) r ≈ Volume of the sphere (a) When n tends to infinity, show that 1/3 S r = V where V and S are the volume and ...Video projection is popular both at home and at the office. For conference room presentations and home theater fun, high reflectivity projection screens provide best viewing result...Derivation. Archimedes, the famous Greek polymath, found that the surface area of a sphere is equal to the curved surface area of a cylinder with a radius equal to the sphere's radius and height equal to the sphere's diameter. Now, the curved surface area of a cylinder is given by –. A_c = 2 \pi r h Ac = 2πrh. 9-1 Higher. PPT. Standard. PDF. Small. PDF. Areas & Perimeters of Full & Partial Circles Volume & Surface Area of a Cylinder. Surface Area of a Cone. Ready-to-use mathematics resources for Key Stage 3, Key Stage 4 and GCSE maths classes.surface area. The surface area of a sphere of radius r r is "4 π r 2 4 π r 2". This formula is explained below. Note: To find the surface area of a sphere, the method "measurement by equivalence" is used. The surface area of sphere of radius r r is equivalent to the curved surface area of a cylinder of radius r r and height 2 r 2 r.Example 1: surface area of a sphere given the radius. Find the surface area of the sphere below. Write your answer to 1 1 decimal place. Write down the formula. To answer the question we need to use the formula …Calculate sphere surface area step by step. Equations. Inequalities. Scientific Calculator. Scientific Notation Arithmetics. Complex Numbers. Polar/Cartesian. Simultaneous Equations. System of Inequalities.Follow the steps given here to use the surface area of sphere calculator: Step 1: Enter the known measure (either the radius or the surface area of the sphere) into the respective input box and the unknown measure will be calculated. Step 2: Select the appropriate units for the input and output. Step 3: You can also select the desired value of ... The intersection of two spherical surfaces is a circle whose plane is perpendicular to the line joining the centers of the spheres and whose center is on that line. (See figure to the right.) A plane perpendicular to a radius at its extremity is tangent to the sphere. Formulas for a Sphere. Surface Area, A The surface area of a sphere is equal ...Jan 18, 2024 · From the area of a sphere calculator, we know that the surface area of a sphere is as below: A(sphere) = 4 × π × r². You can think about it as two times the cap surface area of a hemisphere. Therefore, the hemisphere cap area equals: Ac = A(sphere) / 2. Ac = 2 × π × r². The base surface area is a circle with the same radius as a hemisphere. The Surface area of the sphere= \(\begin{array}{l} 4 \pi r^{2}\end{array} \) square units. Equation of a Sphere Example. Example: Write the equation of the sphere in the standard form where the centre and radius of the sphere are given as (11, 8, …The Surface Area of a Rectangular Prism: It is the area of six rectangles that covers it. But we don't need to find the area of all the six because we know the area of the top is equal to area of bottom and area of the back is equals to the area of the front and left is equal to the right side. Area = 2 (ab + bc + ca)Jun 5, 2023 · The surface area of a sphere A is a measure of the total area that the surface of a sphere occupies. Its value is expressed in squared units of length, e.g., square meters m² or square feet ft². The surface area of a sphere can be found with the following equations: With given radius: A = 4 × π × r², With given diameter: A = π × d², The surface area of a sphere is the area occupied by the curved surface of the sphere. Circular shapes take the shape of a sphere when observed as three-dimensional structures. For example, a globe or a soccer ball. Let us learn about the formula of surface area of a sphere and how to calculate the surface area of a sphere in this lesson. A hemisphere is one-half a sphere, its surface area including the circular cross section. Examples of 3D solid shapes. A prism is a 3D solid with two congruent, opposite faces (bases) with all other faces parallelograms of some sort. Examples of prisms are cubes and triangular, rectangular, hexagonal and octagonal prisms.The surface area of an arbitrary (n − 1)-sphere is proportional to the (n − 1) st power of the radius, and the volume of an arbitrary n-ball is proportional to the n th power of the radius. Graphs of volumes (V n) and surface areas (S n−1) of n-balls of radius 1. The 0-ball is sometimes defined as a single point.Calculator online for a the surface area of a capsule, cone, conical frustum, cube, cylinder, hemisphere, square pyramid, rectangular prism, triangular prism, sphere, or spherical cap. Calculate the unknown defining side lengths, circumferences, volumes or radii of a various geometric shapes with any 2 known variables. Online calculators and …Related Queries: body surface area, 172cm, 58kg; map projections; algebraic degree of sphere; moment of inertia tensor of solid of sphere; surface area of sphereThe formula for finding the surface area of a sphere is 4πr², where r is the radius of the sphere. How do you measure the radius of ...The Volume and surface area formula for Sphere are as follows: Volume of a Sphere (V) = 4/3πr3. Surface Area of a Sphere (A) = 4πr2. Where, π is a mathematical constant approximately equal to 3.14159. r= Radius of the Sphere. The formulas for diameter, area and volume are given in the following table: Property.Find the surface area of a sphere with a radius of 8 meters. First, substitute what you know into the surface area formula. SA = 4πr2 SA = 4π(8)2. Next, use algebra to calculate the surface area. SA = 4π(8)2 SA = 4π(64) SA = 256π SA = 804.25. The answer is 804.25. The surface area of the sphere is 804.25 m2 or 256π m2.The volumes of the two spheres are in the ratio 64 : 27. Find the ratio of their surface areas. Answer. Let V 1 and V 2 be the volumes of two spheres. Now, Let SA 1 and SA 2 be the surface areas of two spheres. So, the ratio of the surface area of the two spheres is 16:9. Question. A cube of side 4 cm contains a sphere touching its sides.The surface area of a sphere is measured to be 100π square meters. What is the diameter of the sphere in meters? Solution: First ...Example 2: If the radius of a sphere is 10 cm, find its surface area. Solution: We know that the surface area of a sphere is given by . Surface Area $= 4$ r2. For the given sphere, r $= 10$ cm. Substituting the value of “r” in the formula, we get, SA $= 4 \times 3.14 \times 10 \times 10$ SA $= 4 \times 3.14 \times 100$ SA $= 1256$ cm² ... The surface area of a sphere is the amount of area of the curved surface of the sphere. It can be calculated by sqaring the radius and then multiplying this by 4 and again by Pi. Grade Booster exam workshops for 2024. Join us in to Birmingham, Bristol, Leeds, London, ...Natural stone is a timeless and elegant choice for flooring, countertops, and other surfaces in your home. However, over time, these surfaces can become dull, stained, or damaged d...Oct 4, 2023 · Calculator online for a the surface area of a capsule, cone, conical frustum, cube, cylinder, hemisphere, square pyramid, rectangular prism, triangular prism, sphere, or spherical cap. Calculate the unknown defining side lengths, circumferences, volumes or radii of a various geometric shapes with any 2 known variables. Online calculators and formulas for a surface area and other geometry problems. The surface area of the sphere pictured on the left is: $$ A = 4\pi \cdot r^2 \\ A = 4\pi \cdot 3^2 \\ A = 36\pi \\ = 113.1 $$ Practice Problems. Problem 1. What is the surface area of a sphere with a diameter of 12 cm? Show …Apr 10, 2022 ... Learn how to find the surface area of a sphere! In this video, you will learn where the surface area equation for a sphere comes from, ...Radius, r =14 cm. By the formula, Surface area of a sphere = 4πr 2. On substitution, we get, SA = 4 x 3.14 x 14 x 14. = 2,461.76 cm 2. Example 2. The diameter of a baseball is 18 cm. Find the surface area of the ball. Solution.A sphere of radius r has surface area 4πr 2.. The surface area (symbol A) of a solid object is a measure of the total area that the surface of the object occupies. The mathematical definition of surface area in the presence of curved surfaces is considerably more involved than the definition of arc length of one-dimensional curves, or of the surface area for polyhedra (i.e., objects with flat ... A sphere is defined by three axes, x-axis, y-axis and z-axis. The region occupied by a circle is simply an area. The formula of the area is πr2. A sphere has a surface area covered by its outer surface, which is equal to 4πr2. It does not have any volume.A sphere is a round-shaped object in three-dimensional space. All points on a sphere’s surface are the same distance from its center point. Some examples of a sphere are a globe, m...Example: Find the surface area of a sphere of radius 7 cm. Step 1: Note the radius of the given sphere. Here, the radius of the sphere is 47 cm. Step 2: We know that the surface area of a sphere = 4πr2. So, substitute the value of the given radius in the equation = 4 × (3.14) × (7)2 = 616 cm2.Oct 4, 2023 · Calculator online for a the surface area of a capsule, cone, conical frustum, cube, cylinder, hemisphere, square pyramid, rectangular prism, triangular prism, sphere, or spherical cap. Calculate the unknown defining side lengths, circumferences, volumes or radii of a various geometric shapes with any 2 known variables. Online calculators and formulas for a surface area and other geometry problems. Surface area is a two-dimensional measurement that is the total area of all surfaces that bound a solid. The basic unit of area is the square unit. Surface Area of a Sphere: …The hot plates smash the cheesy tubes into submission, creating a greater amount of surface area for crisping. Out of all the things I’ve put in my waffle iron, cheese is probably ...So, the radius of the sphere = diameter 2 = 10 cm 2 = 5 cm. We know that the surface area of a sphere is calculated as. A = 4 π r 2. So, the surface area of a sphere of radius 5 cm = 4 × 22 7 × 5 × 5 c m 2. = 4 × 22 × 5 × 5 7 cm. = 314.28 c m 2. Q.3. The surface area of a sphere is 201 sq m.Test your understanding of Volume and surface area with these % (num)s questions. Start test. Volume and surface area help us measure the size of 3D objects. We’ll start with the volume and surface area of rectangular prisms. From there, we’ll tackle trickier objects, such as cones and spheres. The surface area of the sphere pictured on the left is: $$ A = 4\pi \cdot r^2 \\ A = 4\pi \cdot 3^2 \\ A = 36\pi \\ = 113.1 $$ Practice Problems. Problem 1. What is the surface area of a sphere with a diameter of 12 cm? Show …Jun 5, 2023 · The surface area of a sphere A is a measure of the total area that the surface of a sphere occupies. Its value is expressed in squared units of length, e.g., square meters m² or square feet ft². The surface area of a sphere can be found with the following equations: With given radius: A = 4 × π × r², With given diameter: A = π × d², Sphere. Our online calculator provides an easy way to determine the volume and surface area of a sphere. Simply enter the radius of your sphere and the calculator will quickly display the results. A sphere is a three-dimensional shape that is symmetrical and has no flat surfaces or corners. Every point on the surface of a sphere is equidistant ...Answer. Recall that the surface area, 𝐴 , of a sphere of radius 𝑟 is given by the formula 𝐴 = 4 𝜋 𝑟. . Here, we are given the diameter of the sphere, 12.6 cm, which is twice its radius. To apply the formula to work out the surface area, we first need to calculate the radius, so we halve the diameter to get 𝑟 = 1 2. 6 ÷ 2 = 6.The area of a disk enclosed by a circle of radius R is pi*R 2. The formula for the circumference of a circle of radius R is 2*Pi*R. A simple calculus check reveals that the latter is the derivative of the former with respect to R. Similarly, the volume of a ball enclosed by a sphere of radius R is (4/3)*Pi*R 3. And the formula for the surface area of a sphere of …The surface area of a sphere is measured to be 100π square meters. What is the diameter of the sphere in meters? Solution: First, we will plug the surface area value into the …Jul 28, 2017 ... This geometry video tutorial explains how to calculate the volume of a sphere as well as the surface area of a sphere in terms of pi using ...The formula for calculating the surface area of sphere is given by: SA = 4 × π × r2. SA = 4 × 3.14 × 112. SA = 1519.76. The surface area of sphere is 1519.76 cm2. Example 5: A hemisphere has the radius measured to 8.3 cm. Find the surface area of it without the base. Solution: r = 8.3 cm. Since the sphere is a complete curved shape therefore the curved surface area is equal to the total area of sphere. It is also called lateral surface area. Surface Area of Sphere = 4πr², where r is the radius of sphere. A sphere is a solid figure bounded by a curved surface such that every point on the surface is the same distance from the ... Find the surface area of a sphere with a radius of 8 meters. First, substitute what you know into the surface area formula. SA = 4πr2 SA = 4π(8)2. Next, use algebra to calculate the surface area. SA = 4π(8)2 SA = 4π(64) SA = 256π SA = 804.25. The answer is 804.25. The surface area of the sphere is 804.25 m2 or 256π m2.Radius, r =14 cm. By the formula, Surface area of a sphere = 4πr 2. On substitution, we get, SA = 4 x 3.14 x 14 x 14. = 2,461.76 cm 2. Example 2. The diameter of a baseball is 18 cm. Find the surface area of the ball. Solution. Of all the shapes, a sphere has the smallest surface area for a volume. Or put another way it can contain the greatest volume for a fixed surface area. Example: if you blow up a balloon it naturally forms a sphere because it is trying to hold as much air as possible with as small a surface as possible. Press the Play button to see. The sphere has the smallest surface area of all surfaces that enclose a given volume, and it encloses the largest volume among all closed surfaces with a given surface area. The …A study of more than half a million tweets paints a bleak picture. Thousands of people around the world have excitedly made a forceful political point with a well-honed and witty t...The surface area of n-dimensional sphere of radius ris proportional to rn1. S n(r) = s(n)rn1; (2) where the proportionality constant, s(n), is the surface area of the n-dimensional unit sphere. The n-dimensional sphere is a union of concentric spherical shells: dV n(r) = S n(r)dr (3) Therefore the surface area and the volume are related as ...May 21, 2022 · In terms of diameter, the surface area of a sphere is expressed as: \(\color{blue}{S= 4π(\frac{d}{2})^2}\) where \(d\) is the diameter of the sphere. How to calculate the surface area of a sphere? The surface area of a sphere is the space occupied by its surface. We can calculate the sphere surface using the sphere surface area formula.
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Jan 24, 2011 ... In this video, Mahalo math expert Allison Moffett shows you how to find the surface area of a sphere. Surface Area of a Sphere ...Feb 18, 2024 · Example: Find the surface area of a sphere of radius 7 cm. Step 1: Note the radius of the given sphere. Here, the radius of the sphere is 47 cm. Step 2: We know that the surface area of a sphere = 4πr2. So, substitute the value of the given radius in the equation = 4 × (3.14) × (7)2 = 616 cm2. Jul 28, 2017 ... This geometry video tutorial explains how to calculate the volume of a sphere as well as the surface area of a sphere in terms of pi using ...Surface Area of a Sphere. The Greek mathematician Archimedes discovered that the surface area of a sphere is the same as the lateral surface area of a cylinder having the same radius as the sphere and a height the length of the diameter of the sphere. The lateral surface area of the cylinder is 2πrh 2 π r h where h = 2r h = 2 r .The surface area of the sphere pictured on the left is: $$ A = 4\pi \cdot r^2 \\ A = 4\pi \cdot 3^2 \\ A = 36\pi \\ = 113.1 $$ Practice Problems. Problem 1. What is the surface area of a sphere with a diameter of 12 cm? Show …The intersection of two spherical surfaces is a circle whose plane is perpendicular to the line joining the centers of the spheres and whose center is on that line. (See figure to the right.) A plane perpendicular to a radius at its extremity is tangent to the sphere. Formulas for a Sphere. Surface Area, A The surface area of a sphere is equal ...A burn evaluation examines moderate to severe burn injuries. It looks at how deep in the skin a burn has gone (degree of burns) and how much of the body's surface area has been bur...Dec 5, 2021 ... We know that the outer surface area of a whole sphere with radius 𝑟 is given by four 𝜋 times 𝑟 squared. The outer surface area of a quarter ...The surface area of a sphere is four times the area of the largest cross-sectional circle, called the great circle. SA = 4πr2 = πd2. SA = surface area; r = radius of sphere; d = diameter of sphere. When asked to find the surface area of a hemisphere, be sure to read the question carefully. Will the surface area.Sep 2, 2018 ... Today, we derive the formula for the surface area of a sphere using integration.Increased Offer! Hilton No Annual Fee 70K + Free Night Cert Offer! On this week’s MtM Vegas we have so much to talk about including a new look at MSG Sphere and Circus Circus getti...Example 2: If the radius of a sphere is 10 cm, find its surface area. Solution: We know that the surface area of a sphere is given by . Surface Area $= 4$ r2. For the given sphere, r $= 10$ cm. Substituting the value of “r” in the formula, we get, SA $= 4 \times 3.14 \times 10 \times 10$ SA $= 4 \times 3.14 \times 100$ SA $= 1256$ cm² ... .