Question

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.

Answer 1

Cone is formed when ∆ABC is revolved about 5 cm. 

r = 12 cm, 

h = 5 cm.

V = 754.28 cm³ . 

Volume of Cone in problem 7 = 314.29 cm³ 

Volume of Cone in problem 8 = 754.28 cm³ 

∴ ratio of both Volumes = \(\frac{314.20}{754.28}\)

= \(\frac{5}{2}\)= 5 : 12