Please solve question no.15.

It is given that area of square = 121 cm² And now we have to find area of circle As we all know, Area of square =(side)² 121 = (side)² Therefore side(a) = 11 cm The side of square will be equal to radius of circle As we remould square in a circle Therefore Area of circle = πr² = π(a)² =π(11)² = 121π