Unit 2 Vocabulary

Front

Ray

Back

The part of a line consisting of an endpoint together with all the collinear points on one side of the endpoint.

Front

Opposite Rays

Back

Two collinear rays with a common endpoint, forming a straight angle.

Front

Angle

Back

A pair of rays that have a common endpoint called the vertex.

Front

Vertex

Back

The common endpoint of two rays that form an angle.

Front

Angle Addition Postulate

Back

The sum of two adjacent angle measures is equal to the measure of the angle they form.

Front

Angle Bisector

Back

A ray or segment that divides an angle into two congruent parts.

Front

Congruent Angles

Back

Angles that have the same measure.

Front

Adjacent Angles

Back

Two angles that are coplanar, have a common endpoint and common side, but have no common interior points.

Front

Linear Pair

Back

A pair of adjacent angles whose measures sum to 180 degrees.

Front

Vertical Angles

Back

Two nonadjacent angles formed by two intersecting lines; these angles are congruent.