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Ex 13.3, 2 - Find the total surface area of a cone - Area Of Cone

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Ex 13.3, 2 Find the total surface area of a cone, if its slant height is 21 m and diameter of its base is 24 m. [𝐴𝑠𝑠𝑢𝑚𝑒 𝜋=22/7] Total surface area of cone = πr(r + l) Radius (r) of the base of cone = (24/2) m = 12 m Slant height (l) of cone = 21 m Total surface area of cone = πr(r + l) = [22/7×12×(12+21)] m2 = (22/7×12×33) m2 = 1244.57 m2

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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 12 years. He provides courses for Maths, Science, Social Science, Physics, Chemistry, Computer Science at Teachoo.