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If a line has direction ratios 2,-1,-...

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

Text Solution

Verified by Experts

The correct Answer is:
`(2)/(3),(-1)/(3),(-2)/(3)`
D.r.'s of the given line are 2,-1,-2 and `sqrt(2^(2) +(-1)^(2)+(-2)^(2))=sqrt(9)=3`
`:. ` d.c.'s of the given line are `(2)/(3) ,(-1)/(3),(-2)/(3)`
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