Question

ii) An container, opened from the top and made up
of a metal sheet is the form of a frustum of a
cone of height 16cm with radii of its lower and
upper ends are 8cm and 20cm respectively.
Find the cost of metal sheet used to make
container, if it costs 8 per 100cm2.
(it = 3.14)​

Answer 1

Answer:

given,height of frustum is 16cm

and small and big radius is 8 and 20cm respectively.

Then,

volume of frustum= 1/3× 3.14×16(400-64)

= 314/100×16×112

=5,62,668/100×100

= 56.26

Now,cost of metal sheet is =56.26×8

=450

Hence the cost of metal sheet is 450