Ex 13.7, 3 - The height of a cone is 15 cm. If its volume - Ex 13.7

  1. Chapter 13 Class 9 Surface Areas and Volumes (Term 2)
  2. Serial order wise

Transcript

Ex 13.7, 3 The height of a cone is 15 cm. If its volume is 1570 cm3, find the radius of the base. (Use ฯ€ = 3.14) Height of cone = h = 15 cm Let radius of cone = r cm Given Volume of cone = 1570 cm3 1/3 ฯ€r2h = 1570 1/3 ร—3.14ร—๐‘Ÿ2ร—15=1570 1 ร—3.14ร—๐‘Ÿ2ร—5=1570 r2 = 1570/(3.14ร—5) r2 = 100 r = โˆš100 r = โˆš((10)2) r = 10 cm

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Davneet Singh
Davneet Singh is a graduate from Indian Institute of Technology, Kanpur. He has been teaching from the past 10 years. He provides courses for Maths and Science at Teachoo.