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The area enclosed between the concentric...

The area enclosed between the concentric circles is `770\ c m^2` . If the radius of the outer circle is 21 cm, find the radius of the inner circle.

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RD SHARMA-AREAS RELATED TO CIRCLES-All Questions
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  3. The area enclosed between the concentric circles is 770\ c m^2 . If...

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  4. A sector is cut from a circle of radius 21 cm. The angle of the sect...

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  14. An arc of length 20pi cm subtends an angle of 144o at the centre...

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  15. An arc of length 15 cm subtends an angle of 45o at the centre of a ...

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  16. Find the angle subtended at the centre of a circle of radius ' a ' ...

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  17. Find the area of the sector of a circle with radius 4 cm and of ang...

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  18. A sector of a circle of radius 8 cm contains an angle of 135o . Fin...

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  19. The area of a sector of a circle 2 cm is pi\ c m^2 . Find the angle co...

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  20. The area of a sector of a circle 5 cm is 5\ pi\ c m^2 . Find the angle...

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