Question

Two coins of diameter 2cm and 4cm respectively are kept one over the other find the area of shaded region ringed in sq cm

Answer 1

area of circular ring= pie×(R-r)×(R+r)

so, area of ring =
$\pi \times (4 - 2) \times (4 + 2) \\ \frac{22}{7} \times 2 \times 6 \\ 37.71 {cm}^{2}$
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