Question

Find the area of a circular ring whose extranal and internal dimeters are 20 cm and 6 cm respectively

Answer 1

Let R be the outer radius and r be the inner radius

The area of circular ring = π(R²-r²) = π ( 10²-3²) = π (100-9) = π*91 = 22/7*91= 22*13=286cm²

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