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Circumference of a Circle

Observe the a...

Question

Observe the adjacent figure. It shows two circles with the same centre. The radius of the larger circle is $10 c m$ and the radius of the smaller circle is $4 c m$
Find the shaded area between the two circles. (take $π = 3.14$ )

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Solution

Area of shaded region = $π (R^{2} - r^{2})$
= $3.14 (10^{2} - 4^{2})$
= $3.14 \times 84 = 263.76 {c m}^{2}$

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