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

Plane

Back

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

Front

Angle

Back

Formed by two rays (or line segments) that share a common endpoint, called the vertex.

Front

Line Segment

Back

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

Front

Midpoint

Back

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

Front

Parallel lines

Back

Lines in a plane that do not meet; they are always the same distance apart.

Front

Transversal

Back

A line that passes across two or more (usually parallel) lines.

Front

Corresponding angles

Back

Angles that are in the same position on two parallel lines in relation to a transversal.

Front

Alternate interior angles

Back

Angles located between two parallel lines and on opposite sides of a transversal.