Question

The diagonal of a square is 15 m; find the length of its one side and perimeter.

Answer 1

Diagonal of square = 15 m 

Let side of square = a

a² + a² = (15)2 = 225

a² = 225/2 = 112.50

a = √112.50 = 10.6 m

Perimeter = 4 x a = 10.6 x 4 = 42.4 m