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If the radius of a circle is doubled,...

If the radius of a circle is doubled, its area is increased by (a) 100% (b) 200% (c) 300% (d) 400%

A

1.4 times

B

2 times

C

3 times

D

4 times

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NCERT EXEMPLAR-PERIMETER AND AREA-Exercise
  1. If each side of a rhombus is doubled, how much will its area increase?

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  2. If the sides of a parallelogram are increased to twice its original le...

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  3. If the radius of a circle is doubled, its area is increased by (a) ...

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  4. What will be the area of the largest square that can be cut out of a c...

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  5. What is the radius of the largest circle that can be cut out of the re...

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  6. The perimeter of the figure ABCDEFGHIJ is

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  7. The circumference of a circle whose area is 81 pi r^2, is

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

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

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

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

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  12. All triangles are congruent. True or false.

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

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

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

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

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

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  18. 5 hectare = 500 m^2

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

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

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