Geometric Notations

These lessons, with videos, examples and step-by-step solutions, help SAT students review geometric notations.

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The following diagrams show some geometric notations: point, line, line segment, ray, angle, intersecting lines, perpendicular lines, parallel lines. Scroll down the page for examples and solutions.

Geometric Notations

A point has no size; its only function is to show position. We use a single capital letter to name a point.


A line can be used to connect two points. A ine is perfectly straight and continues without end in opposite directions. It has no thickness. We can name a line by picking any two points on the line.

line The line passing through the points A and B
is denoted by line notation

Since the length of any line is infinite, we sometimes use part of a line called a line segment.

line segment


A ray is part of any line that extends without end in one direction.

ray A ray starting from point A and passing through B is denoted by ray notation

A plane has length and width, but no height, and extends infinitely on all sides.


A plane

Geometry Lesson 1 - Building Blocks of Geometry
Introduction to Geometry.


  • Understand and identify the undefined terms point, line and plane.
  • Define segment, ray, angle, collinear, intersect, intersection and coplaner.
  • Investigate postulates about points, lines and planes.

Basic Language and Notation of Geometry
Lines, line segments, rays and points. A little bit about dimensions.

Geometry - Points Lines Planes Space Notation - Part 1 of 2
Intuitive Math Help.
Points, Lines, Line segment, Ray, Plane, Angles

Geometry - Points Lines Planes Space Notation - Part 2 of 2
Intuitive Math Help.
More about angles

Point, Line, Plane
This video explains and demonstrates the fundamental concepts (undefined terms)of geometry: point, line, plane.

Point, Line, Plane, and Space - Geometry Help

Try the free Mathway calculator and problem solver below to practice various math topics. Try the given examples, or type in your own problem and check your answer with the step-by-step explanations.
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