Q : 7    A right triangle ABC with sides 5 cm, 12 cm and 13 cm is revolved about the side 12 cm. Find the volume of the solid so obtained.
 

Answers (1)

When a right-angled triangle is revolved about the perpendicular side, a cone is formed whose,

Height of the cone = Length of the axis= h = 12\ cm

Base radius of the cone = r = 5\ cm

And, Slant height of the cone = l = 13\ cm

We know,

 The volume of a cone = \frac{1}{3}\pi r^2 h

The required volume of the cone formed = \frac{1}{3}\times\pi\times5^2\times12

\\ = \pi\times25\times4 \\ = 100\pi\ cm^3

Therefore, the volume of the solid cone obtained is 100\pi\ cm^3

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