Ex 11.1, 6 - Chapter 11 Class 9 Surface Areas and Volumes

Last updated at April 16, 2024 by Teachoo

Transcript

Ex 11.1, 6
The slant height and base diameter of a conical tomb are 25 m and 14 m respectively. Find the cost of white-washing its curved surface at the rate of Rs 210 per 100 m2.
Curved surface area of tomb = rl
Given slant height = l = 25m
Radius = 14/2 = 7m
Curved surface area of tomb = rl
= (22/7 7 25) m2
= (22 1 25) m2
= 550m2
Cost of whitewashing 100 m2 area = Rs 210
Cost of whitewashing 1 m2 area = Rs 1/100 210
Cost of whitewashing 550 m2 area = Rs 1/100 210 550
= Rs 1155
Therefore, the cost of whitewashing the tomb is Rs 1155

Davneet Singh has done his B.Tech from Indian Institute of Technology, Kanpur. He has been teaching from the past 14 years. He provides courses for Maths, Science, Social Science, Physics, Chemistry, Computer Science at Teachoo.

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