Question

the area of two concentric circles forming a ring are 154 sq cm and 616 sq cm the width of the ring ?if

Answer 1

Let r = radius of inner circle
area of inner circle = 154 cm2
⇒π r2 = 154⇒r2 = 154 × 7 22 = 49⇒r = 7 cm

Let R = radius of outer circle
area of outer circle = 616 cm2
⇒π R2 = 616⇒R2 = 616 × 722 = 196⇒R = 14 cm

width of ring = R - r = 14 - 7 = 7 cm

Answer 2

This your answer.

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