Q. 74.2( 233 Votes )

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.

Answer :

When right-angled ΔABC is revolved about its side 12 cm then a cone is formed having

Height (h) = 12 cm


Radius (r) = 5 cm


Slant height (l) = 13 cm



Volume = r2h


= ×  × 5 × 5 × 12

= 25 × 4 Π cm3

= 100 Π cm3
Now Π = 3.14
So 100 π = 3.14 x 100 = 314 cm3
Hence Volume of the figure = 314 cm3

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