Basic Geometry Terms

Front

Part of a line that consists of two points, called endpoints.

Back

Line segment

Front

A point that divides, or bisects, a segment into two congruent segments

Back

Midpont

Front

An angle with measure between 90° and 180°

Back

Obtuse angle

Front

Two dimensional and extends without end, even though the drawing appears to have edges

Back

Plane

Front

Has no dimension and is represented by a dot

Back

Point

Front

Part of a line that consists of a point called an endpoint and all points on the line that extend in one direction

Back

Ray

Front

An angle with measure equal to 90°

Back

Right angle

Front

An angle with measure equal to 180°

Back

Straight angle

Front

Two angles whose measures have the sum 180°

Back

Supplementary angles

Front

Two angles whose sides form two pairs of opposite rays

Back

Vertical angles