Question

if the length of the diagonal of a square is 20 CM then its perimeter must be​

Answer 1

Answer:

side of the square is equal to ✓2d/2 where d is the diagonal

Step-by-step explanation:

hence side equal to ✓2*20/2=10✓2

hence perimeter=4(10√2)=40✓2

Answer 2

Answer:

diagonal of square = 20

$\sqrt{2 } a \: = \: 20 \\ a \: = \: 20 \div \sqrt{2} \\ a \: = \: 10 \sqrt{2} \\ perimeter \: = \: 4 \times 10 \sqrt{2} \\ = \: 40 \sqrt{2} cm$