Geometry - Angle Classifiers

Adjacent angles

Two angles that lie in the same plane and have a common vertex and a common side, but no common interior points.

Linear pair

Two adjacent angles with noncommon sides that are opposite rays.

Vertical angles

Two nonadjacent angles formed by two intersecting lines.

Congruent angles

Angles that have the exact same measure in degrees.

Complementary angles

Two angles with measures that have a sum of 90 degrees.

Supplementary angles

Two angles with measures that have a sum of 180 degrees.

Perpendicular angles

Lines, segments, or rays that form right angles.

Undefined terms

Intuitive ideas that aren’t defined

Vertex

The meeting point of an angle.

Sides [of an angle]

The lines that make up an angle.

Angle addition postulate

“One part plus another part equals a whole“

Bisector [of an angle]

A ray, line, or segment that divides the angle into two congruent angles.

The word “exists“ means…

“There is at least one.“

The word “unique“ means…

“There is no more than one.“

The word “determine“ means…

“To establish exactly.“