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Question
The area A of a circular ring is π times the difference between the squares of outer radius R and inner radius r. Make a formula for this statement.
Solution
Outer radius = R
Inner radius = r
The difference between the squares of outer radius R and inner radius r = R2 - r2
π times the difference between the squares of outer radius R and inner radius r = π(R2 - r2)
As per the data: A = π(R2 - r2).
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