An undefined term thought of as a location with no size or dimensions. It is the most basic building block in geometry. In a two dimensional coordinate system, a point's location is represented by an ordered pair of numbers (x, y).​

Point

An undefined term thought of as a straight, continuous arrangement of infinitely many points extending forever in two directions. A line has length, but no width or thickness, so it is one dimensional. ​

Line

Collinear

On the same line.

When two or more points are on the same line together.

Endpoint

The point at either end of a segment or the first point of a ray.

A point on a line, and all the points on the line that lie on one side of this point.

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Ray

​The point on the line segment that is the same distance from both endpoints. The midpoint bisects the segment.

Midpoint

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To divide into two congruent parts. ​

Bisects

Segment addition

A property that states if A, B and C are collinear and B is between A and C, then AB + BC = AC.

An undefined term thought of as a flat surface that extends infinitely along its edges. A plane has length and width but no thickness, so it is two dimensional. ​ A plane is notated by a script capital letter or three non-collinear points.

Plane

Coplanar

On the same plane.

When three or more points are on the same plane together.