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Learn in your speed, with individual attention - Teachoo Maths 1-on-1 Class


Transcript

Example 2 The height of a cone is 16 cm and its base radius is 12 cm. Find the curved surface area and the total surface area of the cone (Use π = 3.14). Curved surface area of cone = πr l Here, h = 16 cm and r = 12 cm. Let slant height be l We know that l2 = h2 + r2 l2 = "(16)2 + (12)2" l2 = "256 + 144" l2 = 400 l = √("400" ) l = √("202" ) l = 20 cm Curved surface area of cone = πr l = 3.14 × 12 × 20 cm2 = 753.6 cm2 Total surface area of cone = πr(l + r) = 3.14 × 12 (20 + 12) cm2 = 3.14 × 12 (32) cm2 = 1205.76 cm2

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