Question

find the side of square whose perimeter is 80 CM also find its area

Answer 1

We know that perimeter of a square = 4*side
                         So, side = 80/4
                               side = 20 cm

So, Area of square = (side)²
                               = (20)²
                               = 400 cm²

Answer 2

Perimeter of square = 4×side
80 = 4 × side
side of square =
$\frac{80}{4} = 20cm$
Now, area of square =
${(side)}^{2}$=
${(20)}^{2} = 400 {cm}^{2}$