46. A right triangle with sides 3 cm, 4 cm and 5 cm is rotated the side of 3 cm to form a cone. The volume of the cone so formed is (1) 12 i cm3 (2) 15 t cm (3) 16 t cm3 (4) 20 i cm

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46. Here, radius of cone ( r=3 mathrm{cm} ) and height ( h=4 ) ( mathrm{Cm} ) ( therefore ) Volume of cone ( =frac{1}{3} pi r^{2} h ) ( =frac{1}{3} times pi times(3)^{2} times 4=12 pi mathrm{cm}^{3} )

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