Question

if the perimeter of a square is 80 cm find its side and area

Answer 1

perimeter of square
4a = 80
a = 20
area of square = a^2 
                        = 20*20
                        = 400 cm   

Answer 2

Heya !!!

Given perimeter = 80 cm.
As we know that perimeter = 4 X side.
So, 
Side = P/4
= 80/4 = 20 cm.

Area = side X side 
= 20 X 20
= 400 cm^2.

Hence, side is 20 cm and area is 400 cm^2.

Thanks...