Question 174625
All 4 sides of a square are equal in length
Let each side of the square = {{{x}}}
The perimeter will = {{{4x}}}
The area of any rectangle = length x width
In the square, the legth and width are the same, so
Area = {{{x^2}}}
It is given that
Area = {{{81}}} cm2 , so
{{{81 = x^2}}}
Take the square root of both sides
{{{x = 9}}} cm
Since the perimeter = {{{4x}}}
Perimeter = {{{4*9 = 36}}} cm