Ex 11.3, 4 - Chapter 11 Class 9 Surface Areas and Volumes

Last updated at Dec. 13, 2024 by

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Ex 11.3, 4 If the volume of a right circular cone of height 9 cm is 48 cm3, find the diameter of its base. Height of cone = h = 9 cm Let radius of cone = r cm Given Volume of cone = 48 cm3 1/3 r2h = 48 1/3 r2 (9) = 48 " " 23="48 " r2 = (48 )/3 r2 = 16 r = 16 r = ((4)2) r = 4 cm Diameter = 2 Radius Thus, the diameter of the base of cone is 8 cm.

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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 and Computer Science at Teachoo