A square is formed by joining five small squares of area equal to 80 sq. cm each. Find the perimeter of the bigger square.

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Solution

A large square is formed by joining five small squares of area 80 sq. cm each.
Thus area of large square = 5 times area of each small square = 5 × 80 = 400 sq. cm
Side length of this bigger square = $\sqrt{400}$ = 20 cm
Perimeter of this bigger square = 4 x Side length = 4 x 20 = 80 cm

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