Subscribe to our Youtube Channel - https://you.tube/teachoo

Last updated at Dec. 24, 2019 by Teachoo

Transcript

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.

Examples

Example 1

Example, 2 Important

Example, 3

Example, 4 Important You are here

Example, 5 Important

Example, 6 Important

Example, 7

Example 8

Example, 9 Not in Syllabus - CBSE Exams 2021

Example 10 Not in Syllabus - CBSE Exams 2021

Example 11

Example 12 Important

Example 13 Important

Example 14

Example 15

Example 16 Important

Example 17

Example 18

Example 19 Important

Example 20 Important

Example 21 Important

Example 22 Not in Syllabus - CBSE Exams 2021

Example 23 Important Not in Syllabus - CBSE Exams 2021

Example 24

Example, 25 Important

Example 26

Example 27 Important

Example 28 Important

Example 29 Important

Example 30 Important

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 9 years. He provides courses for Maths and Science at Teachoo.