Question

the area of a circle that's 64 pi square inches long. What's the radius ?

Answer 1

A=pi*r^2  sqrt64=8 in radius

Answer 2

the area of anything cannot be any amount of square inches 'long'
long is 1 dimentional while area is 2 dimentional


anyway
area=(pi)radius^2
64pi=area
therfor
64pi=(pi)radius^2
divide both sides by pi
64=radius^2
sqrt both sides
8=radius
8 inches