Geometry Terms Chapter 1

Front

An angle that measures less than 90 degrees.

Back

acute angle

Front

Two angles that share a common side and vertex but do not overlap.

Back

adjacent angles

Front

Points that lie on the same straight line.

Back

collinear points

Front

A ray that divides an angle into two angles that are congruent

Back

Angle bisector

Front

Two angles whose measures have a sum of 90°

Back

Complementary angles

Front

Segments that have the same length.

Back

congruent segments

Front

A number that identifies a position relative to an axis.

Back

coordinate

Front

Points at the ends of a segment or the starting point of a ray.

Back

endpoints

Front

Points that lie in the same plane

Back

Coplanar points

Front

The region that contains all the points outside of an angle

Back

Exterior