Question

the circumference of two concentric rings are 88cm and 66cm respectively find the width between the rings

Answer 1

Let R = radius of outer circle
circumference of outer circle = 88 cm
⇒2πR = 88⇒R = 88 × 744 = 14 cm⇒2πR = 88⇒R = 88 × 744 = 14 cm

Let r = radius of inner circle
circumference of inner circle = 66 cm
⇒2πr = 66⇒r = 66 × 7 2 × 22 = 10. 5 cm⇒2πr = 66⇒r = 66 × 7 2 × 22 = 10. 5 cm
width of ring = R - r = 14 - 10. 5 = 3.5 cm

Answer 2

C1 = 2πR
88 = 2 * 22/7 * R
R = 88 * 7 / 2 * 22
R = 14 cm

C2 = 2πr
66 = 2 * 22/7 * r
r = 66 * 7 / 22 * 2
r = 21/2
r = 10.5 cm

Width = R - r
= 14 - 10.5
= 3.5 cm

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