Consider two parallel lines that are intersected by a transversal, and when it crosses the two others, many different angle pairs are formed. See the special properties of the angle pairs in this interactive.

Angles, parallel lines, and transversals are explained through examples and a video lesson. [1:01]

Explore lines and angles, and the relationship between the two.

Provides an introduction to geometry with definitions of points, lines, planes and angles through the use of examples and a brief video lesson. [1:28]

Explains angles and parallel lines through examples and a video lesson.

Provides examples and a video lesson that introduce fundamental statements of geometry.

Learn how to construct bisectors of line segments and angles.

Construct a copy of a line segment in this interactive exercise.

Learn the four categories of theorems that have to do with lines and angles.

Explores how to measure the length of a line segment through examples and a video lesson. [0:40]

Discover how to find distances and midpoints by viewing examples and a video lesson. [1:07]

A definition, examples, and a video lesson all help to explain polygons. [0:43]

You can assess your knowledge of the various parts of angles and lines at this web site. You respond to a series of questions. A running total is visible showing the number of correct responses you have as you work your way through the...