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Question

The pillars of an apartment are in a cylindrical shape. If each pillar has a circular base of radius 40 cm and height 20 m, then how much concrete would be required to build 7 such pillars?



Your Answer
A

7040

Correct Answer
B

70.4

Your Answer
C

704

Your Answer
D

7.04


Solution

The correct option is B

70.4


Radius of base of cylinder = 40 cm
Height of cylinder = 20m = 2000 cm
Volume of single cylinder =πr2h=227×40×40×2000

=704000007 cm3
Converting cm3 to m3

1cm=102 m
1 cm3=106 m3
70400000 cm3=70.4 m3

=704000007 cm3 =70.47 m3
Thus, volume of 7 such pillars = Volume of one such pillar x 7 =70.47×7=70.4 m3

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