Question

if the perimeter of a square is 36 cm, then its area is​

Answer 1

perimeter of square is 4a

4a=36
a=36/4
a=9cm

area of square is a×a
so
a×a=9×9=81cm square

Answer 2

perimeter of square-4 x side
36- 4 x side
side =36/4
side =9
area of square =side x side
side =9
9 x 9 =81
area of square =81