Q8 of 75 Page 233

If the triangle ABC in the Question 7 above is revolved about the side 5 cm, then find the volume of the solid so obtained. Find also the ratio of the volumes of the two solids obtained in Questions 7 and 8

When right-angled ΔABC is revolved about its side 5 cm a cone will be formed

Radius (r) = 12 cm


Height (h) = 5 cm


Slant height (l) = 13 cm



Volume = r2h


= * * 12 * 12 * 5


= 240 cm3


Ratio =


= = 5: 12


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