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Area of Circle

Let R and ...

Question

Let $R$ and $r$ denotes the radii of outer and inner circles respectively, then area of the circular ring is calculated using the formula:

A

π (R^{2} + r^{2})

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B

π (R^{2} - r^{2})

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C

2 π (R^{2} + r^{2})

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D

2 π (R^{2} - r^{2})

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Solution

The correct option is B $π (R^{2} - r^{2})$
Area enclosed between two circles $=$ Area of the ring $=$ Area of bigger circle $-$ Area of inner Circle
Area of ring $= π (R^{2} - r^{2})$

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