Let's determine the angles in standard position whose terminal side lie on a coordinate axis.
If the terminal side of angles in standard position lie on the coordinate axis, the angles are called the quadrantal angles.
Quadrantal angles can be said to be angles in standard position whose terminal side lie along one of the axes(x-axis or y-axis).
Examples of quadrantal angles are:
0°, 90°, 180°....
Therefore, angles in standard position whose terminal side lie on coordinate axis are called quadrantal angles.
ANSWER:
Quadrantal angles.