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Volume and Surface Area

Q1: A right triangle with sides 3 cm, 4 cm and 5 cm is rotated the side of 3 cm to form a cone. The volume of the cone so formed is:

A 12 cm3

B 15 cm3

C 16 cm3

D 20 cm3

ANS:A - 12 cm3

Clearly, we have r = 3 cm and h = 4 cm.

 Volume = 1 r2h = 1 x  x 32 x 4 cm3 = 12 cm3.
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