A drinking glass is in the shape of a frustum of acone of height 14 cm. The diameters of its two circular ends are 4 cm and 2 cm. Find the capacity of the glass
Given:
Radius (r1) [Upper base] = 
= 2 cm
Radius (r2) [Lower base] = 
= 1 cm
Capacity of glass = Volume of frustum of cone
= 
h (r12 + r22 + r1r2)
= 
h [(2)2 + (1)2 + (2) (1)]
= 
* 
* 14 [4 + 1 + 2]
= 
= 102 
cm3
Hence, the capacity of the glass = 102 
cm3
3