Q10. A cylindrical hole is drilled in a circular cylinder of height 12cm and base radius 5cm. The height and base radius of the cone are also the same. Find the whole surface and volume of the remaining cylinder?
Solution. Base radius of the cylinder (r) = 5 cm
and height (h) = 12 cm
∴ Volume = πr2h = n (5)2 x 12 cm3 = 300π cm3
∵ The base and height of the cone drilled are the same as those of the cylinder
∴ Volume of cone = (13)πr2h