AI Mentor

Check Your IQ

Free Expert Demo

Try Test

Courses

Dropper NEET Course Dropper JEE Course Class - 12 NEET Course Class - 12 JEE Course Class - 11 NEET Course Class - 11 JEE Course Class - 10 Foundation NEET Course Class - 10 Foundation JEE Course Class - 10 CBSE Course Class - 9 Foundation NEET Course Class - 9 Foundation JEE Course Class -9 CBSE Course Class - 8 CBSE Course Class - 7 CBSE Course Class - 6 CBSE Course

Offline Centres

Find the ratio of the curved surface areas of two cones, if the diameters of the bases are equal and slant heights are in the ratio of 3 : 4.

see full answer

Your Exam Success, Personally Taken Care Of

1:1 expert mentors customize learning to your strength and weaknesses – so you score higher in school , IIT JEE and NEET entrance exams.

An Intiative by Sri Chaitanya

3 : 4

3 : 2

3 : 5

1 : 4

answer is C.

(Unlock A.I Detailed Solution for FREE)

Best Courses for You

JEE

NEET

Foundation JEE

Foundation NEET

CBSE

Detailed Solution

Given, the slant heights are in the ratio of 3 : 4.
In a cone,
radius = r and slant height = l
Let the slant heights of the two cones be 3x and 4x respectively.
And we know CSA of the cone is

π r l

.
The curved surface area of the cone of slant height 3x,

C 1 = π × r × 3 x

The curved surface area of the cone of slant height 4x,

C 2 = π × r × 4 x

Therefore, the required ratio is,

C 1 C 2 = π × r × 3 x π × r × 4 x

C 1 C 2 = 34

Hence, the ratio of the curved surface areas of the two cones is 3:4.
Therefore, the correct option is 3.

Watch 3-min video & get full concept clarity

courses

No courses found

Result Producing online coaching for JEE/NEET of south India

Largest All India Test Series for JEE/NEET

Best Online Course for IIT JEE

Best Online Course for NEET

Best Online Course for CBSE

Ready to Test Your Skills?

Check your Performance Today with our Free Mock Test used by Toppers!

Take Free Test

Get Expert Academic Guidance – Connect with a Counselor Today!