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# How do I find the surface area of a sphere

By Ryan McGuire on the 10th of January, 2013

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To find the surface area you first need to know the radius (this is the distance from the centre to the outside, or half the diameter). For the sake of this example, lets assume the radius is 5cm.

Then you need to use this equation:

pi is an infinite number but at this level you can consider it to be 3.142

5 squared means 5 * 5 which equals 25

So the equation is 4 x 3.142 x 25

So the answer would be 314.2 cm

By henry warren on the 15th of January, 2013

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### (r is radius of circle)

By Dawn Lubka on the 15th of January, 2013

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Surface area of sphere is given below as:

A = 4 x (Pie) x R2

A=SURFACE AREA

PIE= 3.1417

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By AMRITA CHAKRAVARTY on the 21st of January, 2013

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The surface area of a sphere is given by the following formula:

$A = 4\pi r^2.$

Where r is the radius of the circle

By jagadish on the 14th of January, 2013

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The surface area of a sphere formula:

A= 4 pi r2

Example 1  if 'r' = 5 for a given sphere, and p = 3.14, then the surface area of the sphere is:

surface area = 4pr2

= 4 × 3.14 × 52

= 314

By Bridget Gaskin on the 17th of January, 2013

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Let the radius of the sphere be r, then the total surface area of sphere will be A= 4 π r2.

By Adersh Antony on the 19th of January, 2013

## Calculate the surface areas of cylinders, cones and spheres

### How do I find surface area of spheres, cones and cylinders?

Just use these simple equations;

Formula for Surface Area :

Cylinder = 2πr² + 2πrL  (L is the length of the cylinder)

Cone = πr² + πrL   (L is the length from the point of the cone to the edge of the base)

Sphere = 4πr2

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