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