Question

find a width of a ring whose inner and outer radii are r and r respectively​

Answer 1

Answer:

let r be radius of inner ring and R be radius of outer ring

therefore, area a= pi(R²-r²)

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Step-by-step explanation:

area of outer circle= piR²

area of inner circle= pi r²

area of ring= piR²- pi r²= pi(R²-r²)