Basic Geometry Terms

Front

Point

Back

A location in space, represented by a dot.

Front

Line

Back

A straight path that goes on forever in both directions.

Front

Line Segment

Back

A part of a line that has two endpoints.

Front

Ray

Back

A part of a line that has one endpoint and extends forever in one direction.

Front

Parallel Lines

Back

Lines that never intersect and stay the same distance apart.

Front

Perpendicular Lines

Back

Lines that intersect to form a right angle (90°).

Front

Intersecting Lines

Back

Lines that cross at one point but do not necessarily form right angles.

Front

Angle

Back

A figure formed when two rays meet at a common point called a vertex.

Front

Right Angle

Back

An angle that measures exactly 90°.

Front

Acute Angle

Back

An angle that measures less than 90°.