Question 6 The pillars of a temple are cylindrically shaped . If each pillar has a circular base of radius 20 cm and height 10 m, how much concrete mixture would be required to build 14 such pillars? Height of cylinder = h = 10 m Radius = r = 20 cm = 20 × 1/100 m = 2/10 m Volume of concrete in 1 cylindrical pillar = πr2 h = 22/7 × 2/10 × 2/10 × 10 m3 = 88/70 m3 ∴ Volume of concrete in 1 cylindrical pillar = 88/70 m3 So, Volume of concrete in 14 cylindrical pillars = 14 × 88/70 m3 = 17.6 m3

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Davneet Singh

Davneet Singh has done his B.Tech from Indian Institute of Technology, Kanpur. He has been teaching from the past 13 years. He provides courses for Maths, Science, Social Science, Physics, Chemistry, Computer Science at Teachoo.

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