Formed by two rays with the same endpoint.
Angle
0 to 90 degrees
Acute angle
90 degrees
Right Angle
90 to 180 degrees
Obtuse Angle
180 degrees
Straight Angle
Angles with the same measure.
Congruent Angles
Two angles whose sides are opposite rays.
Vertical Angles
Two coplanar angles with a common side, a common vertex, and no common interior points.
Adjacent Angles
Two angles whose measures have sum of 90.
Complementary Angles
Two angles whose measures have sum 180.
Supplementary Angles