Q9 of 75 Page 233

A heap of wheat is in the form of a cone whose diameter is 10.5 m and height is 3 m. Find its volume. The heap is to be covered by canvas to protect it from rain. Find the area of the canvas required

Radius (r) = 5.25 m

Height (h) = 3 m


Volume = r2h


= * * 5.25 * 5.25 * 3


= 86.625 m3


Area of canvas = CSA of cone


= πrl


= πr


= * 5.25 *


= 99.825 m2


More from this chapter

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7

A right triangle ABC with sides 5 cm, 12 cm and 13 cm is revolved about the side 12 cm.

Find the volume of the solid so obtained

 8

If the triangle ABC in the Question 7 above is revolved about the side 5 cm, then find the volume of the solid so obtained. Find also the ratio of the volumes of the two solids obtained in Questions 7 and 8

 1

Find the volume of a sphere whose radius is

(i) 7 cm (ii) 0.63 m

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Find the amount of water displaced by a solid spherical ball of diameter

(i) 28 cm


(ii) 0.21 m