Question

A drinking glass is in the shape of frustum of a cone of height 21 cm with 6 cm and 4 cm as the diameters of its two circular ends. Find the capacity of the glass.
Also find csa & tsa.

Answer 1

Answer:

capacity =volume of frustum

=1/3×22/7×h(r1^2+r2^2+r1r2)

1/3×22/7×21(3^2+ 2^2+3×2)

1/3×22×3(9+4+6)

22×19

418cm cube

csa =22/7×l(r1+r2)

l=root(h^2+(r2^2-r1^2))

tsa = 22/7×l(r1+r2)+22/7(r1^2+r2^2)