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The units for measuring angles
Degrees °

An angle with a measure of 90°
Right angle

An angle with a measure between 0° and 90°
Acute angle

An angle with a measure between 90° and 180°
Obtuse angle

An angle with a measure of exactly 180°
Straight angle

Two angles, that when added together, have a sum of 90°
Complementary angles

Two angles, that when added together, have a sum of 180°
Supplementary angles

Angles that share a common vertex, and a common side, but no common interior points. They are "next to" each other
Adjacent angles

Angles that are nonadjacent, and are formed by two intersecting lines. They are "across" from each other
Vertical angles

Angles with the same measure
Congruent angles

