Question

the area of a square photo is 9 square inches how long is each side of the photo

Answer 1

Let the side of each side of photo is a inch.

So area of photo = (side)^2 = $a^2$

But as given area of photo is 9 square inch.

So $a^2 = 9$

$a = \sqrt{9}$
          $= 3$

So side of photo is 3 inch.