Question

The slant height of a frustum of a cone is 4 cm and the perimeters (circumferences) of
its circular ends are 18 cm and 6 cm. Find the curved surface area of the frustum.
7
22

Answer 1

Answer:

Step-by-step explanation:

Given-

l(slant height)=4cm

R=18cm

r=6cm

CSA of frustum=pi l(R+r)

=22/7×4(18+6)

=22/7×4×24

=88×24/7

=301.71cm²