Ex 11.3, 7 - Chapter 11 Class 9 Surface Areas and Volumes

Last updated at August 7, 2026 by

Ex 11.3, 7 - A right triangle ABC with sides 5 cm, 12 cm - Ex 11.3

part 2 - Ex 11.3, 7 - Ex 11.3 - Serial order wise - Chapter 11 Class 9 Surface Areas and Volumes

 

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Ex 11.3 , 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. Let ABC with right angle at B. AC will be hypotenuse, AC = 13 cm And AB = 12 cm, BC = 5 cm We revolve ABC about the side AB (= 12 cm) , we get a cone as shown in the figure. Radius = r = 5 cm, & Height = h = 12 cm Volume of solid so obtained = 1/3 r2h = (1/3 " " 5 5 12) cm3 = (1 " " 25 4) cm3 = 100 cm3 .

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