Question

write the formula of finding the diagonal of the square​

Answer 1

√ 2 × side

is the formula

can be derived by Pythagoras theroem

Answer 2

To calculate a diagonal of a square, multiply the length of one of the square's sides by the square root of 2. If you don't know the length of one side, you can find it by plugging the square's perimeter into the formula: perimeter = 4s, where s is the length of one side.

$d = s \sqrt{2}$