Ex 11.3, 3 - Chapter 11 Class 9 Surface Areas and Volumes

Last updated at April 8, 2024 by Teachoo

Transcript

Ex 11.3, 3
The height of a cone is 15 cm. If its volume is 1570 cm3, find the radius of the base. (Use π = 3.14)
Height of cone = h = 15 cm
Let radius of cone = r cm
Given
Volume of cone = 1570 cm3
1/3 πr2h = 1570
1/3 ×3.14×𝑟2×15=1570
1 ×3.14×𝑟2×5=1570
r2 = 1570/(3.14×5)
r2 = 100
r = √100
r = √((10)2)
r = 10 cm

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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