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Sir what are direction ratios and direction cosines?

Asked by Drona 22nd February 2013, 7:48 PM
Answered by Expert
Answer:
For any vector r = ai+bj+ck, the direction ratios are simply a:b:c while the direction cosines are 
 
In other words, direction ratios represent the ratio of the distance that you need to move in x, y and z direction in order to reach a specific point whereas direction cosines are the cos of the angles that the vector makes with x, y and z direction. 
Answered by Expert 22nd February 2013, 9:44 PM
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