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Last updated at Dec. 24, 2019 by Teachoo

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Example, 4 Find the direction cosines of x, y and z-axis. x axis makes an angle 0 with x axis, 90 with y axis & 90 with z axis. So, = 0 , = 90 , = 90 Direction cosines are l = cos 0 , m = cos 90 , n = cos 90 l = 1 , m = 0, n = 0 Direction cosines of x axis are 1, 0, 0. y axis makes an angle 90 with x axis, 0 with y axis & 90 with z axis. So, = 90 , = 0 , = 90 Direction cosines are l = cos 90 , m = cos 0 , n = cos 90 l = 0 , m = 1, n = 0 Direction cosines of y axis are 0, 1, 0. z axis makes an angle 90 with x axis, 90 with y axis & 0 with z axis. So, = 90 , = 90 , = 0 Direction cosines are l = cos 90 , m = cos 90 , n = cos 0 l = 0 , m = 0, n = 1 Direction cosines of z axis are 0, 0, 1.

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Chapter 11 Class 12 Three Dimensional Geometry

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About the Author

Davneet Singh

Davneet Singh is a graduate from Indian Institute of Technology, Kanpur. He has been teaching from the past 9 years. He provides courses for Maths and Science at Teachoo.