Question

What is the radius of a sphere if its surface area is 2,122.64 square inches?

Answer 1

The radius = 13 square inches.

Explanation:

The surface are of a sphere has the formula `SA=4pir^2`

`SA =2122.64` so `2122.64 =4pir^2`

divide both sides by `4pi` or `12.56`

`169=r^2` and taking the square root of each side, the answer is `r=13` square inches.