Question

if the area of a concentric circle are 154cm and 616 cm respectively then find the width and area of the circular path between them​

Answer 1

Answer:

Let r = radius of inner circlearea of inner circle = 154 cm2⇒π r2 = 154⇒r2 = 154 × 7 22 = 49⇒r = 7 cmLet R = radius of outer circlearea of outer circle = 616 cm2⇒π R2 = 616⇒R2 = 616 × 722 = 196⇒R = 14 cmwidth of ring = R - r = 14 - 7 = 7 cm

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