Question

17. 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
(a) 120πcm3 (b) 15πcm3 (c) 16πcm3 (d) 20πcm3​

Answer 1

Answer:

the triangle is rotated to form a cone of radius 4cm and slant height 5cm

the volume of a cone is 1/3πr^2h

$v = \frac{1}{3} \pi {4}^{2} \times 3 \\ = 16\pi {cm}^{3}$

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