Question

f diagonal of square=20cm. Find its side

Answer 1

let each side of the square be x
Then according to phythagoras theorem we will have
x²+x²= (20)²
=> 2x²=20²
=> √2x²=20
=> x√2 = 20
=> x= 20/√2

or x = 20√2/2 = 10√2