Question

A wire is bent in the form of a squre of side 16.5cm .it is straightened and then bent into a circle what is the radius of the circle so formed ?

Answer 1

Perimeter of square=4×16.5
=66cm


Perimeter of square=Perimeter of circle
66=2πr
33=πr
33×7/22=r
10.5cm =r

Answer 2

here side of square is s=16.5

perimeter of square is 4s

=>4*16.5

=>perimeter is 66 cms which is length of wire and this length of wire becomes circumference of circle .

hence circumference of circle is 2πr=66

=>2*3.14*r=66

=>r=10.5 cm is the radius of circle