Question

perimeter of a square is 40 cm its one of its diagonal is 12 cm find the other diagonal and area​

Answer 1

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Let each side of a square ABCD be x cm,whose

diagonals = AC= BD= 12cm

Area of square = x^2 sq. cm.

In right angled triangleABC,

AB^2+ BC^2 = AC^2

x^2 + x^2 = 12^2

2x^2 = 144

x^2 = 72