Question

if the length of a diagonal of a square is 20 cm, then its perimeter is​

Answer 1

Answer:

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Answer 2

Diagonal of square = 20 cm.

We know that Area of Square = 1/2 × d²

= 1/2 × 20 × 20

= 10×20

= 200 cm².

Also, area = side²

So,

side = √area

side = √200

Side = 10√2 cm.

Perimeter= 4 × side

= 4 × 10√2

= 40√2 cm.

Hence the perimeter of the square is 40√2 cm.