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Byju's Answer

Standard IX

Mathematics

Area of a Circular Ring

The area betw...

Question

The area between two concentric circles of radii $r_{1}$ and $r_{2},$ is equal to [ $r_{2} > r_{1}$ ]

zero

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π r_{1}^{2}

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π r_{2}^{2}

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πr22-πr12

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Solution

The correct option is D πr22-πr12
The area between two concentric circles is shaded in blue as shown in the figure:
Area of the shaded region $=$ Area of bigger circle $-$ Area of smaller circle.
$= π r_{2}^{2} - π r_{1}^{2}$

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The area between two concentric circles of radii r1 and r2, is equal to [r2>r1]

The correct option is D πr22-πr12The area between two concentric circles is shaded in blue as shown in the figure: Area of the shaded region = Area of bigger circle − Area of smaller circle. =πr22−πr21

The area between two concentric circles of radii $r_{1}$ and $r_{2},$ is equal to [ $r_{2} > r_{1}$ ]

The correct option is D πr22-πr12
The area between two concentric circles is shaded in blue as shown in the figure:
Area of the shaded region $=$ Area of bigger circle $-$ Area of smaller circle.
$= π r_{2}^{2} - π r_{1}^{2}$