Find the approximate radius of a sphere with a surface area of 400 square inches.

The equation for surface area of a sphere is SA=4*pi*r^2

We can plug in what we know to solve for r

400=4*pi*r^2

100=pi*r^2 (divide out the 4)

100/pi=r^2 (divide out the pi)

√ (100/pi) = r (square root of both sides)

r=5.6 rounded to the nearest tenth