A steel wire when bent in the form of square encloses an area of 121cm2. If the same wire is bent in the form of a circle, find the area of the circle.
Area of square = 121 cm2
a2 = 121
a = = 11cm
Perimeter of square = length of wire
4a = 4 ×11 = 44cm
Perimeter of circle = 2πr
2πr = 44
= 7cm
Area of circle = πr2
Area of circle = = 154cm2