Acute Angle Adjacent Angles Complementary Angles Obtuse Angle Right Angle Supplementary Angles Vertical Angles

Acute Angle - An angle that measures less than 90 degrees.

Adjacent Angles - Two angles that have a common vertex and a common side but do not overlap.

Complementary Angles - Two angles that add up to 90 degrees.

Obtuse Angle - An angle that measures between 90 and 180 degrees.

Right Angle - An angle that measures exactly 90 degrees.

Supplementary Angles - Two angles that add up to 180 degrees.

Vertical Angles - Two non-adjacent angles formed by the intersection of two lines. They are congruent (equal in measure).