Question

The diagonal of square is 20 centimetre find its perimeter

Answer 1

let the side be a cm

as we know..

$\sqrt{2} a = 20$

$a = 20 \div \sqrt{2} \\ a = 10 \sqrt{2} \\ perimeter = 40 \sqrt{2}$

HOPE IT HELPS U

Answer 2

Answer:

40

Step-by-step explanation:

Use Pythagoras theorem to find the side of square that is-

(x)²+(x)²=200

On solving u get- (x)²=100

Then x=10

perimeter=4x=40