Question

A ball has a radius of 1 foot. What is the surface area of the ball?

Answer 1

The surface area of the ball is
`4\pi\ ft^(2)`

Explanation:

we know that

The surface area of a sphere ( a ball) is equal to

`SA=4\pi r^(2)`

In this problem we have

`r=1\ ft`

substitute

`SA=4\pi (1^(2))=4\pi\ ft^(2)`

Answer 2

The surface area of any sphere is 4 π (radius)².

When the radius is 1 ft, the surface area is

4 π (1 ft)² = 4π ft² .