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

The area of a semicircle of radius 4t is

A

`5pit^2`

B

`4pit^2`

C

`12 pit^2`

D

`2 pit^2`

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NCERT EXEMPLAR-PERIMETER AND AREA-Exercise
  1. The area of a square is 100 cm. The circumference (in cm) of the large...

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

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

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

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  5. All triangles are congruent. True or false.

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

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

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

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

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

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  11. 5 hectare = 500 m^2

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

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

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

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

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

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

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

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

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  20. Ratio of the area of DeltaWXY to the area of DeltaWZY is 3:4 (Fig. 9...

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