Question

The funnel of tin sheet consist of a cylindrical portion 10 cm long attached to a frustum of a cone. if diameter of the top and bottom of the frustum is 18 cm and 8 cm respectively and the sorry
slant height of the frustum of a cone is 13 cm. find the surface area of the tin required to make the funnel.

Answer 1

The answer is 249π cm^2

The following are the steps::-

CSA of cylinder = 2πrh

= 2 x π x 4 x 10

= 80π

CSA Of frustum = π(r1 + r2)l

= π ( 9 + 4)13

= π x 13 x 13

= 169π

TSA of funnel = CSA of cylinder + CSA of frustum

= 80π + 169π

= 249π

Therefore the surface area of funnel is 249π cm²

HOPE IT HELPS YOU!!