What's the length of one side in inches?

Question

a painting hung in an art gallery is a square with an area of 9ft square. What's the length of one side in inches?

Answer 1

For a square, its area is the square of the side measurement.

If the area is 9 sq. ft, then you must find some number which, when it is squared (multiplied by itself), produces 9.

Can you find it?