Geometry Vocabulary

Front

Perpendicular

Back

Two lines that intersect at a right angle.

Front

Segment

Back

Measurable part of a line consisting of two endpoints.

Front

Congruent

Back

Identical in form.

Front

Parallel

Back

Two lines that never touch.

Front

Angle Addition Postulate

Back

If point B is in the interior of angle AOC, then the measure of angle AOB + the measure of angle BOC = the measure of angle AOC.

Front

Segment Addition Postulate

Back

If point B is between points A and C, then AB + BC = AC.

Front

Ray

Back

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

Front

Line

Back

A straight path that extends infinitely in both directions.

Front

Point

Back

A location with no shape or size.

Front

Bisector

Back

A line, ray, or segment that divides an angle or segment into two equal parts.