Last updated at May 29, 2018 by Teachoo

Transcript

Example, 2 If a line has direction ratios 2, 1, 2, determine 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 = 2, 1, 2 = 2, b = 1, c = 2 Also, 2 + 2 + 2 = 22 + ( 1)2 + ( 2)2 = 4 + 1 + 4 = 9 = 3 Direction cosines = 2 + 2 + 2 , 2 + 2 + 2 , 2 + 2 + 2 = , ,

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Chapter 11 Class 12 Three Dimensional Geometry

Serial order wise

About the Author

Davneet Singh

Davneet Singh is a graduate from Indian Institute of Technology, Kanpur. He has been teaching from the past 8 years. He provides courses for Maths and Science at Teachoo. You can check his NCERT Solutions from Class 6 to 12.