MCQ
A right triangle with sides 3 cm, 4 cm and 5 cm is rotated about the side of 3 cm to form a cone. The volume of the cone so formed is
Options
12π cm3
15π cm3
16π cm3
20π cm3
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Solution
Radius of cone VAOB
r = 4 cm
Height of cone VAOB
h = 3 cm
The volume of cone VAOB
`=1/3 pi r^2 h`
`=1/3pi(3)^2 xx 4`
`=12 pi cm^3`
Concept: Frustum of a Cone
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