CBSE Class 12 Math 2012 Solved Paper

Question : 5 of 29

Marks: +1, -0

If a line has direction ratios 2,-1,-2 then what are its direction cosines?

Solution:

The direction cosines are

2/√{2^2+(-1)^2+(-2)^2}

{-1}/√{2^2+(-1)^2+(-2)^2}

{-2}/√{2^2+(-1)^2+(-2)^2}

2/3 , -1/3 , -2/3

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