Example 2 - If line has direction ratios 2, -1, -2, find cosines - Examples

  1. Chapter 11 Class 12 Three Dimensional Geometry
  2. Serial order wise
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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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