When a right ∆ABC revolves about its side AB = 12 cm. The solid thus obtained is single cone having the base radius, r = 5 cm and height of the cone h = 12 cm.
Volume of cone = πr2h unit3
V = (1/2) x π x (5)2 x 12
V = 100π cm3
Hence, the volume of solid cone = 100π cm3