The inner and outer circumference of a circular ring is 44 cm and 88cm Find the width of the - Maths - Perimeter and Area

Question

The inner and outer circumference of a circular ring is 44 cm and
88cm Find the width of the ring and also find its area

Varun.Rawat · Accepted Answer

Let R be the external radius and r be the internal radius
Now, outer circumference = 88 cm⇒2πR = 88⇒2×227×R = 88⇒R = 14 cmNow, inner circumference = 44 cm⇒2πr = 44⇒2×227×r = 44⇒r = 7 cmNow, width of the ring = R - r = 14 - 7 = 7 cmArea of ring = πR2 - r2=227142 - 72=227196 - 49=227×147=462 cm2

The inner and outer circumference of a circular ring is 44 cm and 88cm. Find the width of the ring and also find its area.