Q2 of 70 Page 19

The pillars of a temple are cylindrically shaped. If each pillar has a circular base of radius 20 cm and height 10 m. How much concrete mixture would be required to built 14 such pillars?


Given,


Radius of base of cylindrical pillar = 20 cm = .20 m


Height = 10 m


So, concrete require to make a pillar = πr2h =


=


Concrete required for 14 such pillars =


More from this chapter

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14

Twenty cylindrical pillars of the Parliament House are to be cleaned. If the diameter of each pillar is 0.50 m and height is 4 m. What will be the cost of cleaning them at the rate of Rs. 2.50 per square metre?

 1

A soft drink is available in two packs – (i) a tin can with a rectangular base of length 5 cm and width 4 cm, having a height of 15 cm and (ii) a plastic cylinder with circular base of diameter 7 cm and height 10 cm. Which container has greater capacity and by how much?

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The inner diameter of a cylindrical wooden pipe is 24 cm and its outer diameter is 28 cm. The length of the pipe is 35 cm. Find the mass of the pipe, if 1 cm3 of wood has a mass of 0.6 gm.

 4

If the lateral surface of a cylinder is 9.42 cm2 and its height is 5 cm, find :

(i) radius of its base


(ii) volume of the cylinder [Use π = 3.14]