Question

length and breadth of a rectangle are 40 cm and 10 cm respectively
perimeter of a square of area equal to that of the rectangle.
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Answer 1

here, length of rectangle (l) is 40cm

breadth (b) is 10 cm

let, side of required square be of length a cm

ATQ,

ar rectangle=ar square

lb=a²

a²=40*10

a²=400

a=√400=20cm

Now, perimeter of this square

=4a

=4x20

=80cm„

Answer 2

Area of a rectangle = l×b

= 40×10

= 400cm

Hence perimeter of square = 400 cm