Question

if the slant height of the frustum cone is 10 cm and perimeter of a circular base are 18 cm and 28 CM respectively what is the curved surface area of the frustum​

Answer 1

Answer:

230 cm²

Step-by-step explanation:

Let the two radii be r and R.

l = 10 cm

1st perimeter = 18cm

∴ 2πr = 18

r = 9/π  -------------- 1

2nd perimeter = 28cm

∴ 2πR = 28

R = 14/π  -------------- 2

CSA of frustum : -

πl ( r + R )

10π ( 9/π + 14/π )

10π ( 23/π)

10 (23)

230 cm²