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The area of the region between two conce...

The area of the region between two concetric circles is `770cm^2` If the radius of the greater circle is 21 cm.Find the radius of the smaller circle.

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R G PUBLICATION-AREAS RELATED TO CIRCLES-EXERCISE
  1. The area of the region between two concetric circles is 770cm^2 If the...

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  2. The radii of two circle are 19 cm and 9 cm respectively.Find the radiu...

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  3. The radii of two circle are 19 cm and 9 cm respectively.Find the radiu...

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  4. Fig.12.3 depicts an archerytarget marked with its five scoring regions...

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  5. The wheels of a car of diameter 80cm each.How many complete revolution...

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  6. Tick the correct answer in the following and justify your choice:If th...

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  7. Find the area of a sector of a circle with radius 6 cm if angles of th...

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  8. Find the area of a quadrant of a circle whose circumference is 22 cm.

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  9. The length of the minute hand of a clock is 14 cm.Find the area swept ...

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  10. A chord of a circle of radius 10 cm subtends a right angle at the cent...

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  11. A chord of a circle of radius 10 cm subtends a right angle at the cent...

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  12. In a circle of radius 21 cm,an arc subtends an angle of 60^@ at the ce...

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  13. In a circle of radius 21 cm,an arc subtends an angle of 60^@ at the ce...

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  14. In a circle of radius 21 cm,an arc subtends an angle of 60^@ at the ce...

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  15. A chord of circle of radius 15 cm subtends an angle of 60^@ at the cen...

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  16. A chord of a circle of radius 12cm subtends an angle of120^@at the cen...

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  17. A brooch is made with silver wire in the form of a circle with diamete...

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  18. A brooch is made with silver wire in the form of a circle with diamete...

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  19. An umbrella has 8 ribs which are equally spaced (see Fig.12.13). Assu...

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  20. A car has two wipes which do not overlap.Each wiper has a blade of len...

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  21. To warn ships for underwater rocks,a lighthouse spreads a red coloures...

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