The projections of a line segment on the coordinate axes are 12, 4, 3 respectively. The length and direction cosines of the line segment are
Answer & explanation
Correct answer: option 1
Length of the line segment $= \sqrt{12^2 + 4^2 + 3^2}= 13 $
∴ Direction cosines are $\frac{12}{13}, \frac{4}{13}, \frac{3}{13}$