Question

The radius and height of a cone are in the ratio 4:3 . The volume of the cone is 269 and half cm cube. Find the curved surface area of the cone

Answer 1

Step-by-step explanation:

Given let 'r' be radius and 'h' be height of cone 

then  [hr=34] ...(1)

and volume of cone =26921cm3

⇒ now volume=31πr2h=26921

from (1) [h=43r]

31πr2×43r=2539

r3=2×π4×539=343.033343

[r=7cm]   now  h=43×7=421cm

now CSA of coneπrl=πrr2+h2

=πrr2+h2