Question

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

Answer 1

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`