Question

The perimeter of square is 40 cm . Its area is ?

Answer 1

perimeter of square = 40 cm
=>4 x side = 40
=> side = 40/4
=>side = 10 cm

=>Area of square = 10 x 10
=>Area of square = 100 cm^2
Hope it will help you...........

Answer 2

Perimeter of a square  = 4a

4a = 40

a = 40 /4

a = 10(side of square)

Area of a square = a²

a² = 10²

Therefore,

Area of a square = 100 cm²

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