If a square mirror has a 20 inch diagonal, what is the approximate perimeter of the mirror, in inches?

If a square mirror has a 20 inch diagonal, what is the approximate perimeter of the mirror, in inches?

A 56.56

B 40

C 50

D 60

Solution

Correct Answer: Option A

Suppose, Side of square = x

Here, √2x =20

Or,2x2 = 400

or,x2=200 Or,x =14.1421 So,perimeter = 4 X 14.1421 =56.56