Question

A directed line makes angles \[\alpha\], \[\beta\], and \[\gamma\] with the positive x-, y-, and z-axes respectively. What are these angles called?

Options

• Distance ratios of the line

• Direction angles of the line

• Direction ratios of the line

• Direction cosines of the line

Answer 1

The angles \[\alpha\], \[\beta\], and \[\gamma\] made by a directed line with the positive x-, y-, and z-axes are called direction angles. They specify the orientation of the directed line in space.