## Algebra 1: Common Core (15th Edition)

A square has equal sides, and the area of a square is determined by the formula: $Area=length^{2}$. In this problem, the area is provided as $225$. Plug the given area into the formula: $\sqrt 225=\sqrt {length^{2}}$ Simplify: $15= length$. Therefore, the length of the square is 15 inches.