Basic Geometry Terms

Front

Point

Back

A location in space with no dimensions, represented by a dot.

Front

Line

Back

A straight one-dimensional figure having no thickness and extending infinitely in both directions.

Front

Segment

Back

A part of a line that is bounded by two distinct end points.

Front

Ray

Back

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

Front

Plane

Back

A flat, two-dimensional surface that extends infinitely far.

Front

Collinear

Back

Points that lie on the same line.

Front

Coplanar

Back

Points or lines that lie on the same plane.

Front

Angle

Back

The figure formed by two rays, called the sides of the angle, sharing a common endpoint, called the vertex of the angle.

Front

Midpoint

Back

The point on a line segment that divides it into two equal parts.

Front

Segment Bisector

Back

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