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Ex 11.1, 3 - If a line has direction ratios -18, 12, -4, then - Direction cosines and ratios

Ex 11.1, 3 - Chapter 11 Class 12 Three Dimensional Geometry - Part 2

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Ex 11.1, 3 If a line has the direction ratios 18, 12, 4, then what are its direction cosines? If direction ratios of a line are a, b, c direction cosines are 2 + 2 + 2 , 2 + 2 + 2 , 2 + 2 + 2 Given, Direction ratios = 18, 12, 4 = 18, b = 12, c = 4 2+ 2+ 2 = 18 2+122+ 4 2 = 324+144+16 = 484 = 22 Direction cosines = 2 + 2 + 2 , 2 + 2 + 2 , 2 + 2 + 2 = 18 22 , 12 22 , 4 22 = , ,

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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.