# The area of a square is 81 cm^2. What is the perimeter of the square?

Mar 6, 2016

Perimeter = 36cm

#### Explanation:

The area of a square = ${l}^{2}$
where l is the length of the square's side.

${l}^{2} = 81 \Rightarrow l = \sqrt{81} = 9$

hence Perimeter = $4 \times 9 = 36 c m$