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The area covered by two concentric circl...

The area covered by two concentric circles is 770 `cm^2`. The outer radius is 21 cm. Find the inner radius of circle.

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MBD-Areas of Plane Figures.-Exercise
  1. When a wire is bent into a square then it covers the area of 121 cm^2....

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  2. A piece of paper is in the form of rectangle ABCD in which AB=18cm,BC=...

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  3. The area covered by two concentric circles is 770 cm^2. The outer radi...

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  4. ABCD is a square of side 4 cm. With every comer as the centre, quadran...

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  5. In the figure, the shaded portion shows the area cleaned by the wiper ...

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  6. A horse is thetered to graze the grass at one comer of a rectangular p...

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  7. There are 64 equal squares in the chess board and every Square has are...

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  8. A horse is thethered to one corner of a rectangular field of dimension...

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  9. A sheet of paper is in the form of a rectangle ABCD in which AB = 40 c...

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  10. A playground isin the form of a rectangle whose both sides are taken a...

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  11. The length of minute hand clock is 14 cm. Find the area covered by the...

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  12. The radius of the circle is 14 m. Find the radius of another circle wh...

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  13. The diameter of a semi circular protector is 14 cm. Find its perimeter

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  14. A wire is in the form of a circle of radius 42 cm. It is converted int...

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  15. A mirror is fitted into four circular windows of radius 28 cm. Find th...

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  16. The area of a rectangular floor of side 40 m is 960 m^2. The carpets o...

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  17. To cover the rectangular field with grass at the rate of 85 paise per ...

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  18. The ratio of length and breadth of a rectangular field is 7 : 4. A pat...

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  19. ABCP is one-fourth of the circle whose radiusis 14 cm. Taking AC is di...

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  20. A copper wire is bent in the form of a square whose area is 484 m2. If...

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