Bihar Police Constable Model Paper 2

Given:
Area of the square = 400 ${\mathit{m}}^2$
Formula Used:
Area of the square = ${\mathit{a}}^2$
The perimeter of the square = 4 × a
Where a = side of the square
Calculation:
Area of the square = 400 ${\mathit{m}}^2$
⇒ ${\mathit{a}}^2$ = 400
⇒ a = $\sqrt{400}$
⇒ a = 20 m
The perimeter of the square = 4 × a
⇒ 4 × 20
⇒ 80 m
∴ The perimeter of the square is 80 m.