Question

Calculate the area of a circle ring whose internal and external radii are 3 cm and 10cm respectively

Answer 1

Area of a circular ring
$= \pi( {R}^{2} - {r}^{2}) \\ = \frac{22}{7} \times ( {10 }^{2} - {3}^{2}) \\ = \frac{22}{7} \times (100 - 9) \\ = \frac{22}{7} \times 91 \\ = 22 \times 13 \\ = 286 {cm}^{2}.$




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Answer 2

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