Question

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

Answer 1

diagonal is 10 cm

let side of square be x
so by Pythagoras theoram
$2 {x}^{2} = {10}^{2} \\ {x}^{2} = 50 \\ x = 5 \sqrt{2}$
now perimeter of square is

4×side

so perimeter=20√2