Question

A wire is in the shape of the semicircle of perimeter 72 cm. If the same wire is bent in the shape of a full circle, then find the ratio of the radii of both shapes​

Answer 1

Answer:

perimeter of semicircle=πr=72m

therefore, radius r1=72/π m

bent this wire in circle

then, perimeter of circle=2πr=72m

therefore, radius r2=36/π

so,r1/r2=(72/π)/(36/π)=2

ie ratio of radii is 2:1