###### Asked in Math and ArithmeticAlgebraGeometry

Math and Arithmetic

Algebra

Geometry

# How do you find the surface area of a sphere?

## Answer

###### Wiki User

###### March 09, 2009 11:29AM

S=4*pi*r2

## Related Questions

###### Asked in Math and Arithmetic, Geometry

### How do you figure out surface area for half sphere?

To do this question, we have to ask ourself, what formula do you
use to find the surface area of a sphere.
The answer should be known to you, but it is 4πr2.
Since we know how to find the surface area for a full sphere,
then finding the surface for a half sphere is just half the
job.
You use the formula for the full sphere 4πr2, and divide it by
2... so (4πr2) / 2 .
Voila!

###### Asked in Math and Arithmetic, Geometry, How To

### How to find the surface area of a half sphere?

Find the surface area of the full sphere [ A = 4 pi R2 ] and
then take half of it.
You wind up with [ 2 pi R2 ] for the outside surface area of a
half sphere, or
[ 4 pi R2 ] for the (inside + outside) surface area of the half
sphere. (Since
the inside and outside are now both exposed to the weather, you
probably
want to paint both surfaces.)