Madhya Pradesh Police Exam Model Paper 1

Given:
Perimeter = 80 m
All sides are equal. So, it’s a square
Concept Used:
Perimeter of square = 4 × sides
Area of square = $\mathit{s}\mathit{i}\mathit{d}{\mathit{e}}^2$
Calculation:
P = 4 × a
⇒ 80 = 4 × a
⇒ a = 20
Area = ${\mathit{a}}^2$
= 202
= 400
∴ The area of that field = 400 ${\mathit{m}}^2$ .