Question

12. Two concentric circles have radil of 14 cm and 7 cm respectively. Find the are
between them.​

Answer 1

Answer:

$area \: of \: bigger \: circle = 2\pi {r}^{2} \\ = 2 \times \frac{22}{ 7} \times 14 \times 14 \\ = 1232 {cm}^{2} \\ also \: \\ area \: of \ smaller \: circle = 2\pi {r}^{2} \\ 2 \times \frac{22}{7} \times 7 \times 7 \\ = 616 {cm}^{2} \\ \\ \\ \\ area \: of \: region \: between \: them = (1232 - 616) = 616 {cm}^{2}$

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