Question

If the circumference of two concentric circles forming a ring are 88cm and 66 cm respectively.Find the width of the ring

Answer 1

Circumference of outer circle = 88 cm
2* pi *r = 88
=> 2*22*r/7 = 88
=> r = 2*7
=> r = 14 cm

Radius of outer circle = 14 cm


Circumference of inner circle = 66 cm
2*pi *R = 66
=> 2*22*R/7 = 66
=> R = 3*7/2
=> R = 10.5 cm

Radius of inner circle = 10.5 cm


Width of ring = 14 - 10.5
= 2.5 cm