Question

Write the direction cosines of a line parallel to z axis

Answer 1

if a line is parallel to z axis, it makes 0 degree with the z axis and at the same time makes 90 degrees with x axis and y axis . so, the direction cosines of that line would be: (cos 90, cos 90, cos 0) = (0, 0, 1)

Answer 2

if a line parallel then directo og z axis in 90 to x.