Chapter 1 Vocabulary

Front

Acute Angle

Back

An angle that is less than 90°.

Front

Adjacent Angles

Back

Angles that are next to each other.

Front

Angle

Back

Two rays with a common endpoint

Front

Angle Bisector

Back

A ray that divides an angle in half.

Front

Collinear Points

Back

Points that lie in a straight line.

Front

Congruent

≌

Back

Having the same size

Congruent segments have the same measure.

Congruent angles have the same number of degrees.

Front

Symbol for Congruent

Back

≅

Front

Coplanar Points

Back

Points that lie in the same plane.

Front

Intersection

Back

The set of points in both shapes. Example: The intersection of two lines is a point.

Front

Line

Back

Undefined term; Straight path; Extends in two directions without ending