Surface Area of a Sphere
We previously calculated the volume of a
sphere, now we are going to calculate the surface area of a
sphere. Let's look at the green sphere. Each sphere has a
radius which we have labelled r. The radius of
any sphere is the distance between the center of the sphere and
the surface. It doesn't matter where on the surface of the
sphere you measure the radius 'r' to. The
distance between the center point of the sphere and any point
on the surface of the sphere is the same.
Equation for the surface of the sphere
The formula for calculating the surface of a
sphere is given by:
In another word, the surface area of a
sphere is four pi r squared or four time
pi times r times
r where pi is given by:
That's it. Now you can calculate the surface
area of any spheres!
