Question

What is the radius of a sphere if its surface area is 2,122.64 square inches? (Use 3.14 for π.)

Answer 1

We want to solve for r, so we can do the following:
\[4\pi r^2\]=2122.64
Divide by 4:
\[\pi r^2\]=530.66
Divide by 3.14:
\[r^2\]=169
\[\sqrt{r^2}=\sqrt{169}\]
r=13