Question

A circular track has an inside circumference 528m, if the width of the track is 3.5 m, find the outer circumference

Answer 1

cir. of inner circle=2×22/7×r

528=2×22/7×r
r=528×7/2×22
r=336

total r=336+3.5
=341.5

cir. of outer circle=2×22/7×r
=2×22/7×341. 5
=50.59