1800-212-7858 (Toll Free)
9:00am - 8:00pm IST all days
8104911739

or

Thanks, You will receive a call shortly.
Customer Support

You are very important to us

022-62211530

Mon to Sat - 11 AM to 8 PM

# RD Sharma Solution for Class 9 Mathematics Chapter 20 - Surface Areas and Volume of A Right Circular Cone

Our RD Sharma Textbook Solutions are considered extremely helpful for solving the tough questions which are asked in the CBSE Class 9 exam. TopperLearning Textbook Solutions are compiled by subject experts. Herein, you can find all the answers to the textbook questions for Chapter 20 - Surface Areas and Volume of A Right Circular Cone.

All our solutions are created in accordance with the latest CBSE syllabus, and they are amended from time to time to provide the most relevant answers. Our free RD Sharma Solutions for CBSE Class 9 Mathematics will strengthen your fundamentals in Mathematics and will help you in your attempts to score more marks in the final examination. CBSE Class 9 students can refer to our solutions any time — while doing their homework and while preparing for the exam.

Exercise/Page

## RD Sharma Solution for Class 9 Mathematics Chapter 20 - Surface Areas and Volume of A Right Circular Cone Page/Excercise 20.1

Solution 1

Solution 2

Solution 3

Solution 4

Solution 5

Solution 6

Solution 7

Solution 8

Solution 9

Solution 10

Solution 11

Solution 12

Solution 13

Solution 14

Solution 15

(i)    Slant height of cone = 14 cm
Let radius of circular end of cone be r.
CSA of cone =

Thus, the radius of circular end of the cone is 7 cm.

(ii)    Total surface area of cone = CSA of cone + Area of base
=
Thus, the total surface area of the cone is 462 .

Solution 16

Solution 17

Solution 18

Solution 19

Height (h) of conical tent = 8 m
Radius (r) of base of tent = 6 m
Slant height (l) of tent =
CSA of conical tent =  = (3.14  10)  = 188.4

Let length of tarpaulin sheet required be L.
As 20 cm will be wasted so, effective length will be (L - 0.2 m)
Breadth of tarpaulin = 3 m
Area of sheet = CSA of tent
[(L - 0.2 m)  3] m = 188.4
L - 0.2 m = 62.8 m
L = 63 m

Thus, the length of the tarpaulin sheet will be 63 m.

Solution 20

Solution 21

Solution 22

Solution 23

## RD Sharma Solution for Class 9 Mathematics Chapter 20 - Surface Areas and Volume of A Right Circular Cone Page/Excercise 20.2

Solution 1

(i)    Radius (r) of cone = 6 cm
Height (h) of cone = 7 cm
Volume of cone

(ii)   Radius (r) of cone = 3.5 cm
Height (h) of cone = 12 cm
Volume of cone
(iii)

Solution 2

(i)    Radius (r) of cone = 7 cm
Slant height (l) of cone = 25 cm
Height (h) of cone
Volume of cone
Capacity of the conical vessel =  litres= 1.232 litres (ii)    Height (h) of cone = 12 cm
Slant height (l) of cone = 13 cm
Volume of cone   = 314.28 cm3
Capacity of the conical vessel = litres =  litres.

Solution 3

Solution 4

Solution 5

Solution 6

Solution 7

Solution 8

Solution 9

Solution 10

Solution 11

Solution 12

Solution 13

(i)    Radius of cone =   =14 cm
Let height of cone be h.
Volume of cone = 9856 cm3
h = 48 cm        Thus, the height of the cone is 48 cm.   (ii)   Slant height (l) of cone
Thus, the slant height of the cone is 50 cm.   (iii)    CSA of cone = rl =

Solution 14

Depth (h) of pit = 12 m
Volume of pit = Capacity of the pit = (38.5  1) kilolitres = 38.5 kilolitres

Solution 15

## RD Sharma Solution for Class 9 Mathematics Chapter 20 - Surface Areas and Volume of A Right Circular Cone Page/Excercise 20.24

Solution 1

A cone has two surfaces as follows: one curved surface and another bottom surface.

Hence, correct option is (b).

Solution 2

Solution 3

Solution 4

Solution 5

Solution 6

Solution 7

Solution 8

Solution 9

Solution 10

Solution 13

Solution 14

Solution 11

Solution 12

Solution 15

Solution 16

Solution 17

## Browse Study Material

TopperLearning provides step-by-step solutions for each question in each chapter in the RD Sharma textbook for class 9. Access the CBSE Class 9 Mathematics Chapter 20 - Surface Areas and Volume of A Right Circular Cone for free. The textbook questions have been solved by our subject matter experts to help you understand how to answer them. Our RD Sharma Textbook Solutions will help you to study and revise, and you can easily clear your fundamentals of Chapter 20 - Surface Areas and Volume of A Right Circular Cone.

# Text Book Solutions

CBSE IX - Mathematics

## This content is available for subscribed users only.

OR

Call us

1800-212-7858 (Toll Free) to speak to our academic expert.
OR

Let us get in touch with you