Question

what is your correct answer in stepwise

Answer 1

Diagonal is given to be 10√2 cm

We know diagonal = √2 * a

where a is the side of the square.

So √2*a=10√2cm

√2 gets cancelled

a=10cm

Perimeter=4*a

Perimeter=4*10cm=40cm

Your answer option(d)

Hope it helps you.