Foundations of Geometry Vocabulary

Front

An exact location. It has no size, only position.

Back

Point

Front

A straight path connecting two points and extending beyond the points in both directions.

Back

Line

Front

A rule that has been proven to be true (using facts that were already known).

Back

Theorem

Front

Exactly equal in size and shape.

Back

Congruent

Front

A statement accepted as true without proof.

Back

Postulate

Front

Two angles that add up to 180°.

Back

Supplementary

Front

The point halfway between two given points.

Back

Midpoint

Front

A pair of adjacent angles that form a straight line or are formed by intersecting lines.

Back

Linear Pair

Front

Two rays sharing a common endpoint.

Back

Angle

Front

All points between two given points (including the given points themselves).

Back

Segment