Ask a Doubt
Request a call back

Join NOW to get access to exclusive study material for best results

CBSE Class 9 Answered

a cone of height 8 m has a curved surface area 188.4 square metres. find its volume (take pi = 3.14
Asked by nmenghani | 11 Jan, 2010, 08:59: PM
answered-by-expert Expert Answer

CSA of a cone = πSR = 188.4 m2

S = 188.4/(3.14xR) = 60/R

R2 = (S2-h2)

R2 = (60/R)2- 82

R4 + 64R2 - 3600 = 0

r2 + 64r - 3600 = 0         ... where r = R2

r = [-64±(4096+4x3600)]/2

= [-64±136]/2

Hence r = 36, and R = 6 m.

Volume of a cone = πR2h/3 = (3.14x6x6x8)/3 = 301.44 m3.

Regards,

Team,

TopperLearning.

 

 

Answered by | 30 Nov, 2017, 12:41: PM

Application Videos

Concept Videos

Multiple Choice Questions Practice Test
Answered Unanswered My Questions My Answers
CBSE 9 - Maths
the cap of a joker is conical in which 30.8 sq.cm of cloth is used . Also the circumference of its base is 17.6 cm .(i) find the height if the cap. (ii)find the slant height of the cap (iii)find the radius of the base of the cap (iv) what is the volume of the cone ?(leave the answer in pie)
Asked by dr.amuthaswaminathan | 27 Jan, 2024, 06:00: PM
ANSWERED BY EXPERT ANSWERED BY EXPERT
CBSE 9 - Maths
i need 5 question based on cube volume 
Asked by vivekgautam6542 | 07 Jun, 2019, 03:36: PM
ANSWERED BY EXPERT ANSWERED BY EXPERT
CBSE 9 - Maths
find the volume of circuler cone with  1. radius6cm ,height7cm  
Asked by kundankumarshah789 | 31 Dec, 2018, 01:52: PM
ANSWERED BY EXPERT ANSWERED BY EXPERT
CBSE 9 - Maths
if  slant height of a cone is changed by 10% while radius remains unchanged then the volume changes by  
Asked by anshuman457biswas | 22 Jul, 2018, 02:55: PM
ANSWERED BY EXPERT ANSWERED BY EXPERT
CBSE 9 - Maths
If the radius of the base and altitude of a right circular cylinder and a right circular cone are equal. What is the relation between the volumes of a cylinder to that of a cone?
Asked by Topperlearning User | 17 Oct, 2017, 01:14: PM
ANSWERED BY EXPERT ANSWERED BY EXPERT
CBSE 9 - Maths
If the radius of the cone is doubled, what will be the effect on its volume?
Asked by Topperlearning User | 17 Oct, 2017, 01:25: PM
ANSWERED BY EXPERT ANSWERED BY EXPERT
CBSE 9 - Maths
An isosceles triangle with a base of 0.4 m and an altitude of 0.3 m is revolved about a line through the vertex and perpendicular to the base. What is the volume of the solid generated by the revolving triangle?
Asked by Topperlearning User | 17 Oct, 2017, 12:53: PM
ANSWERED BY EXPERT ANSWERED BY EXPERT
CBSE 9 - Maths
The circumference of the base of the cone of height 12 cm is 22 cm. Calculate its volume.
Asked by Topperlearning User | 17 Oct, 2017, 01:17: PM
ANSWERED BY EXPERT ANSWERED BY EXPERT
CBSE 9 - Maths
The area of the base of a conical toy of height 9 cm is 616 cm2. Calculate its volume.
Asked by Topperlearning User | 17 Oct, 2017, 01:27: PM
ANSWERED BY EXPERT ANSWERED BY EXPERT
CBSE 9 - Maths
The volume of a right circular cone of base area 13.86 cm2 is 55.44 cm3. Calculate its height.
Asked by Topperlearning User | 17 Oct, 2017, 01:24: PM
ANSWERED BY EXPERT ANSWERED BY EXPERT
My Class Videos Tests ₹ Plans Ask a Doubt
Get Latest Study Material for Academic year 24-25 Click here
×