The Total solution for NCERT class 6-12
A drinking glass isin the shape of a frustum of a cone of height 14 cm. The diameters of its twocircular ends are 4 cm and 2 cm. Find the capacity of the glass.
Radius (r1) of the upper base = 4/2= 2 cm
Radius (r2) of lower the base = 2/2= 1 cm
Height = 14 cm
Now, Capacity of glass = Volume of frustum ofcone
So, Capacity of glass = (⅓)×π×h(r12+r22+r1r2)
= (⅓)×π×(14)(22+12+(2)(1))
∴ The capacity of the glass = 102×(⅔) cm3