A right triangle with sides 3 cm,


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) 12π cm3

(b) 15π cm3

(c) 16π cm3

(d) 20π cm3


Radius of cone VAOB

r = 4 cm

Height of cone VAOB

h = 3 cm

The volume of cone VAOB

$=\frac{1}{3} \pi r^{2} h$

$=\frac{1}{3} \pi(3)^{2} \times 4$

$=12 \pi \mathrm{cm}^{3}$

Hence, the correct answer is choice (a).

Leave a comment


Click here to get exam-ready with eSaral

For making your preparation journey smoother of JEE, NEET and Class 8 to 10, grab our app now.

Download Now