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If the radius of a circle is tripled, th...

If the radius of a circle is tripled, the area becomes

A

9 times

B

3 times

C

6 times

D

30 times

Text Solution

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The correct Answer is:
A
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NCERT EXEMPLAR-PERIMETER AND AREA-Exercise
  1. The circumference of a circle whose area is 81 pi r^2, is

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  2. The area of a square is 100 cm. The circumference (in cm) of the large...

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  3. If the radius of a circle is tripled, the area becomes

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  4. The area of a semicircle of radius 4t is

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  5. All triangles have the same base and the same altitude. True or false.

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  6. All triangles are congruent. True or false.

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  7. All triangles are equal in area. True or false.

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  8. All triangles have the same perimeter. True or false.

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  9. In Fig. 9.29 ratio of the area of triangle ABC to the area of triangle...

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  10. Triangles having the same base have equal area. True or false

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  11. Ratio of circumference of a circle to its radius is always 2 pi : I.

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  12. 5 hectare = 500 m^2

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  13. An increase in perimeter of a figure always increases the area of the ...

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  14. Two figures having the same area cannot have different perimeters. Tru...

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  15. If area of a parallelogram is 24 cm^2 and one of the side is of length...

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  16. A hedge boundary needs to be planted around a rectangular lawn of size...

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  17. The perimeter of a rectangle is 40 m. Its length is four metres less t...

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  18. A wall of a room is of dimensions 5 mx 4 m. It has a window of dimensi...

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  19. Rectangle MNOP is made up of four congruent rectangles (Fig. 9.31). If...

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  20. In Fig. 9.32, area of DeltaAFB is equal to the area of parallelogram A...

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