1.

Freedom equation of a line is (whereare direction cosines) x = x_(1) + lr, y =y_(1) +mr, z=z_(1) + nr, where:

Answer»

R is the DISTANCE of (X,y,Z) from `(x_(1), y_(1), z_(1))`
`|r|` is the distance of (x,y,z) from `(x_(1),y_(1) ,z_(1))`
r is the distance of `(x_(1), y_(1), z_(1))` from the origin
NONE of these

Answer :B


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