Geometry-Ch 1 Vocab

Front

What is a segment bisector?

Back

A point, ray, line segment, or plane that intersects the segment at its midpoint.

Front

What is an angle that has a measure of 180° called?

Back

Straight angle.

Front

What is the region that contains all the points outside of an angle called?

Back

Exterior.

Front

What is the common endpoint of the two rays that form an angle called?

Back

Vertex.

Front

What is an axiom?

Back

A statement accepted as true without proof.

Front

What is a ray?

Back

A part of a line that starts at a point and extends infinitely in one direction.

Front

What is a line segment?

Back

A part of a line that has two endpoints.

Front

What is an acute angle?

Back

An angle that measures less than 90°.

Front

What is an obtuse angle?

Back

An angle that measures more than 90° but less than 180°.

Front

What is a right angle?

Back

An angle that measures exactly 90°.