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The ratio of areas of two circle is 4:1,...

The ratio of areas of two circle is `4:1`, then the ratio of their radius is

A

`4:1`

B

`2:1`

C

`1:2`

D

`1:4`

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KALYANI PUBLICATION-AREAS RELATED TO CIRCLES-EXERCISE
  1. A path of 7m width runs around a circular park whose radius is 18m. Fi...

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  2. In the adjoining figure the boundary of the shaded region consist of f...

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  3. The area of incircle of an equilateral triangle is 154cm^2then the per...

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  4. The inside perimeter of a running track as shown in the adjoining figu...

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  5. The inside perimeter of a running track as shown in the adjoining figu...

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  6. A chord of a circle of radius 14cm substends a right angle at the cent...

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  7. If the area of the sector is 5/8 times, the area of the circle, find t...

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  8. If OABC is a quadrant of a circle whose centre is O and radius r, find...

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  9. What is the angle substended at the centre of a circle of radius 4cm b...

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  10. If arc length of a sector is l and radius of the circle is r. Write th...

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  11. Area of the circle is .

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  12. The perimeter of a circle is known as .

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  13. Area of an arc of a sector angle theta is .

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  14. If the area of a circle and the circumference of it is numerically equ...

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  15. If the altitude of an equilateral triangle be h and the circle inscrib...

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  16. The ratio of areas of two circle is 4:1, then the ratio of their radiu...

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  17. Area of a quadrant of circle whose circumference is 22cm.

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  18. Area of a sector of angle p^@ of a circle with radius R is

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  19. A wheel has diameter 84cm. Then the nuumber of complete revolutions ma...

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  20. The area of a circle that can be inscribed in a square of side 6cm is

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