Radius of the outer circle is 18 cm and the radius of the inner circle is 7 cm. What is the area of the region between the outer and the inner circles?

275π cm²

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361π cm²

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133 cm²

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192.5 cm²

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Solution

The correct option is A
275π cm²

Area of the region in between outer and inner circle = Area of outer circle – Area of inner circle
Area of the outer circle = $π (18)^{2}$ = 324 $π c m^{2}$
Area of the inner circle = $π (7)^{2}$ = 49 $π c m^{2}$
So, area of the required region = 324 $π$ - 49 $π$ = 275 $π c m^{2}$

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Radius of the outer circle is 18 cm and the radius of the inner circle is 7 cm. What is the area of the region between the outer and the inner circles?

The correct option is A 275π cm2 Area of the region in between outer and inner circle = Area of outer circle – Area of inner circle Area of the outer circle = π(18)2 = 324 πcm2 Area of the inner circle = π(7)2 = 49 πcm2 So, area of the required region = 324 π - 49π = 275 πcm2