Example 1 - Chapter 11 Class 12 Three Dimensional Geometry (Term 2)
Last updated at Dec. 11, 2021 by Teachoo
Examples
Example 1
You are here
Example, 2 Important
Example, 3
Example, 4 Important
Example, 5 Important
Example, 6 Important
Example, 7
Example 8
Example, 9 Deleted for CBSE Board 2022 Exams
Example 10 Important Deleted for CBSE Board 2022 Exams
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 Deleted for CBSE Board 2022 Exams
Example 23 Important Deleted for CBSE Board 2022 Exams
Example 24
Example, 25 Important Deleted for CBSE Board 2022 Exams
Example 26
Example 27 Important
Example 28 Important
Example 29 Important
Example 30 Important
Chapter 11 Class 12 Three Dimensional Geometry (Term 2)
Serial order wise
Transcript
Example 1 If a line makes angle 90°, 60° and 30° with the positive direction of x, y and z-axis respectively, find its direction cosines.Direction cosines of a line making angle 𝛼 with x- axis, 𝛽 with y- axis and 𝛾 with z – axis are l, m, n. l = cos 𝜶, m = cos 𝜷 , n = cos 𝜸 Here, 𝛼 = 90° , 𝛽 = 60° , 𝛾 = 30° So, direction cosines of the line are l = cos 90° , m = cos60° , n = cos 30° l = 0 , m = 1/2 , n = √3/2 Therefore, direction cosines are 0, 𝟏/𝟐, √𝟑/𝟐
