Question

perimeter of a square is 20. it's area is 25 find the side

Answer 1

4a=20
a=5
side is 5 unit

Answer 2

Perimeter of Square = 20 unit
Area = 25 sq. unit
⇒  a²= 25
⇒  a = √25
⇒  a = 5 unit

Since Perimeter is equal to 4×side,

  4a = 20
⇒ a = $\frac{20}{5}$

⇒ a = 5 unit.

.·. Each Side measures 5 unit.