Acute Angle: An angle that measures less than 90 degrees.
Adjacent Angles: Two angles that share a vertex and a side.
Complementary Angles: Two angles whose sum is 90 degrees.
Obtuse Angle: An angle that measures between 90 and 180 degrees.
Right Angle: An angle that measures 90 degrees.
Supplementary Angles: Two angles whose sum is 180 degrees.
Vertical Angles: Two angles across from each other when two lines intersect.