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Q: Formula for area of a sphere?

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Surface area of a sphere = 4 x (pi) x (radius)2

The surface area is about 314.16 cm2The formula for the surface area of a sphere is 4 (pi) r2For a radius of 5 cm, the surface area is4 (3.1416) (5)2 = 4 (3.1416)(25) = about 314.16 cm2*Do not confuse the sphere's surface area formula SA = 4 (pi) r2 withthe formula for the volume of the sphere, which is V = 4/3 (pi) r3

Take the surface area of the sphere as of it was whole, and divide by the amount of the sphere that is missing.

Surface area of a sphere is: 4 pi r2, where r=radius.

( The volume of a sphere is (4/3)(pi)r3 ). The short answer: because of calculus. The long answer: This can be seen by using calculus to derive the volume of a sphere from the formula from it's surface area. To do this, we imagine that the sphere is full of infinity thin spheres inside it (all centered at the big sphere's center), and add up the surface areas of all the spheres inside. The formula for the surface area of a sphere is 4(pi)r2. Let's call R the radius of the big sphere we want to find the volume of. To find the volume of this sphere, we add up the surface areas of all the spheres whose radii range from 0 to R. This gives the following formula (where r is the radius of each little sphere): 0R∫ 4(pi)r2dr The 4 and pi can be factored out giving: 4(pi) (0R∫r2dr) Integrating gives: 4(pi) [r3/3]0R This is where the three comes from. Finishing the evaluation of the integral gives: 4(pi)(R3/3 - 03/3) = 4(pi)(R3/3) Which can be rewritten as (4/3)pi(R3) which is the formula for the volume of a sphere.

Related questions

Surface area of a sphere = 4πr2

The formula for the surface area of a sphere is: 4 pi r 2

Formula for calculating the area of sphere is : 4 * pi * r * r

Surface area of a sphere = 4*pi*radius2

The formula for the surface area of a sphere is 4*pi*r2

Surface area of a sphere = 4*pi*radius2

The formula for the surface area of a sphere.

Use the formula for volume to solve for the radius of the sphere and then plug that radius into the formula for the surface area of a sphere.

Surface Area of a Sphere = 4 pi r2

Surface area of a sphere: A = 4πr2So, surface area = 4pi52

The formula for the surface area of a sphere is 4πr2. The formula for the volume of a sphere is 4/3πr3.

A sphere has only a surface area and no lateral area since it has no base. The surface area is 4(pi)r2.

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