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Divakar Pandey
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Divakar Pandey
Asked: November 5, 20202020-11-05T07:09:40+00:00 2020-11-05T07:09:40+00:00In: Class 9

A bus stop is barricaded from the remaining part of the road, by using 50 hollow cones made of recycled cardboard. Each cone has a base diameter of 40 cm and height 1 m. If the outer side of each of the cones is to be painted and the cost of painting is Rs 12 per m², what will be the cost of painting all these cones? (Use π= 3.14 and take √(1.04 )= 1.02)

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NCERT Solutions for Class 9 Maths Chapter 13
Important NCERT Questions
Surface Areas and Volumes
NCERT Books for Session 2022-2023
CBSE Board, UP Board and Other state Boards
EXERCISE 13.3
Page No:221
Questions No:8

2020-2021cbsechapter 13class 9mathematicsncertsurface areas and volumes
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    1. Aarani
      2021-07-30T10:14:09+00:00Added an answer on July 30, 2021 at 10:14 am

      Get Hindi Medium and English Medium NCERT Solution for Class 9 Maths to download.
      Please follow the link to visit website for first and second term exams solutions.
      https://www.tiwariacademy.com/ncert-solutions/class-9/maths/chapter-13/

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      rajesh joshi
      2023-03-06T04:16:29+00:00Added an answer on March 6, 2023 at 4:16 am

      Radius of cone r = 40/2 = 20 cm = 0.2 m and height h = 1 m
      Let the slant height = lm
      We know that l² = r² + h²
      ⇒ l² = (0.2)² + 1² = 0.04 + 1 = 1.04
      ⇒ l = √1.04 = 1.02 m
      Curved surface area of 50 cones = 50 × 6.4056 = 32.028 m²
      Cost of painting at the rate of Rs 12 per m² = Rs 12 × 32.028 = 384.34 (approx.)
      Hence, the cost of painting the curved surface of 50 cones is Rs 384.34.

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