Question

If a line makes an angle 30°, 60°, 90° with the positive direction of x, y, z axes respectively, then find its direction cosines.

Answer 1

Since, the direction cosine of line which makes an angle of a, b, g with x, y and z are cos a, cos b and cos g.

\(\therefore\) Dc's of given line are cos \(30^\circ,\) cos \(60^\circ,\) cos \(90^\circ\)