Find the area of the space enclosed by two concentric circles of radii $25 c m$ and $17 c m$ .

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Solution

$π [R^{2} - r^{2}]$
$\Rightarrow π [R + r] [R - r]$
$\Rightarrow π [25 + 17] [25 - 17]$
$\Rightarrow \frac{22}{7} \times 42 \times 8$
$\Rightarrow 1056 c m^{2}$

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