Question
The areas of two concentric circles forming a ring are 154 sq. cm and 616 sq.cm . the breadth of the ring is :
Answer: Option A
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` pi R_1^2 = 616`
`hArr R_1^2 = ( 616 xx 7/22)` = 196
`hArr R_1 = 14 cm`
`pi R_2^2 = 154`
`hArr R_2^2 = (154 xx 7/22) = 49`
`hArr R_2 = 7 cm`
Breadth of the ring = `(R_1 - R_2) cm = (14 - 7) cm = 7 cm`
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