Question

Find the side and perimeter of a square whose diagonal is 10 cm

Answer 1

side is 5root 2 and
perimeter= 20root 2

Answer 2

Let each side of square be x

According to Pythagorean Theoram,
h^2=s^2×s^2
10^2=x^2×x^2
100=x^4
x=10cm

Perimeter=4*10=40cm

Hope it helps...