The projections of the line segment AB on the coordinate axes are –9, 12, -8 respectively. The direction cosines of the line segment AB are :
Answer & explanation
Correct answer: option 1
Length of segment $AB=\sqrt{81+144+64}=17$
Thus direction cosines of AB are
$-\frac{9}{17}, \frac{12}{17}, \frac{-8}{17}$