Ask a Doubt
Request a call back

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

CBSE Class 9 Answered

A conical cover is required for a chimney.It must be 24cm in diameter at the base and 16cm in height.Find the area of metal sheet required to make it.  
Asked by sriyogithas | 24 Aug, 2020, 03:28: PM
answered-by-expert Expert Answer
Given: r = 12 cm and h = 16 cm
Area of metal sheet = Curved surface area of cone = pi rl
straight l equals square root of straight h squared plus straight r squared end root equals square root of 256 plus 144 end root equals square root of 400 equals 20 space cm Area space of space metal space sheet space equals space πrl space equals space 22 over 7 cross times 12 cross times 20 equals 754.28 space cm squared
Answered by Renu Varma | 25 Aug, 2020, 12:44: PM

Concept Videos

Multiple Choice Questions Practice Test
Answered Unanswered My Questions My Answers
CBSE 9 - Maths
if the volume of a cone is 7546cm³ and its height is 21cm find its curved surface area
Asked by surajdabas414 | 15 Nov, 2023, 05:34: PM
ANSWERED BY EXPERT ANSWERED BY EXPERT
CBSE 9 - Maths
The radii of two cones are equal. If their slant heights are in the ratio 5:8, find the ratio of their curved surface area.
Asked by Sanjuhi4998 | 29 Jan, 2022, 01:35: PM
ANSWERED BY EXPERT ANSWERED BY EXPERT
CBSE 9 - Maths
curved surface area of a cone is 308 cm2 and it's slant height is 14 cm find (i) radius of the base and (ii)total surface area of the cone
Asked by anirani51 | 01 Dec, 2021, 10:24: PM
ANSWERED BY EXPERT ANSWERED BY EXPERT
CBSE 9 - Maths
If the slant height of a cone 12cm and radius of the base is 14 cm, then the total surface area is --------------.
Asked by pia.jhirwal | 08 Jan, 2021, 11:32: AM
ANSWERED BY EXPERT ANSWERED BY EXPERT
CBSE 9 - Maths
A conical cover is required for a chimney.It must be 24cm in diameter at the base and 16cm in height.Find the area of metal sheet required to make it.  
Asked by sriyogithas | 24 Aug, 2020, 03:28: PM
ANSWERED BY EXPERT ANSWERED BY EXPERT
CBSE 9 - Maths
The slant height of a cone is increased by 10% if the radius remains the same find the increase in C.S.A
Asked by nayananayanakt | 01 Mar, 2020, 07:06: PM
ANSWERED BY EXPERT ANSWERED BY EXPERT
CBSE 9 - Maths
There are two cones. The C.S.A of one is twice that of other. The slant height of latter is twice than that of former. Find radius of their height.  
Asked by Susanta | 09 Feb, 2020, 11:15: PM
ANSWERED BY EXPERT ANSWERED BY EXPERT
CBSE 9 - Maths
The slant height and altitude of a conical tomb is 15m and 12m.Find the cost of the white washing it at Rs 70 per month square
Asked by vaishnavi.taware | 26 Jan, 2020, 07:21: PM
ANSWERED BY EXPERT ANSWERED BY EXPERT
CBSE 9 - Maths
diameter of the base of a cone is 10.5cm and its slant height is 10cm. Find its curved surface area
Asked by anmolmahali | 14 Nov, 2019, 07:33: PM
ANSWERED BY EXPERT ANSWERED BY EXPERT
CBSE 9 - Maths
A conical tent is to accomodate 11 person.Each person must have 4 square metres of space on the ground and 20 cubic metres of air to breath.Find the height of the tent
Asked by hridhyavijay | 16 Feb, 2019, 10:34: 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
×