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Geometric Notations

Videos, solutions, games, activities and worksheets to 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.


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.


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

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