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

##### 1 Answer

Mar 6, 2016

#### Answer:

Perimeter = 36cm

#### Explanation:

The area of a square =

# l^2 #

where l is the length of the square's side.

#l^2 = 81 rArr l = sqrt81 = 9 # hence Perimeter =

#4xx9 = 36cm#