Question

if a square has an area of 225 square feet what is the length of each side

Answer 1

The area of the square: $A=a^2$

where "a" is a length of side.


Therefore:
$A=225\ ft^2\ and\ A=a^2\Rightarrow a^2=225\Rightarrow a=\sqrt{225}\Rightarrow \boxed{a=15\ (ft)}$