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Tool: Exterior Angles of a Transversal - Math Open Reference
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An interactive applet and associated web page that demonstrate the exterior angles that are formed where a transversal crosses two lines. The applet shows the two possible pairs of exterior angles in turn when in animation mode. By dragging the three lines, it can be seen that the angles are supplementary only when the lines are parallel. When not in animated mode, there is a button that alternates the two pairs of angles.

The text on the page discusses the properties of the angle pairs both in the parallel and non-parallel cases.

Applet can be enlarged to full screen size for use with a classroom projector. After use in the classroom, student can access it again from any web browser at home or in the library with no login required.

This resource is a component of the Math Open Reference Interactive Geometry textbook project at

Technology Type: Java Applet 
Author: John page
Language: English 
Cost: Does not require payment for use

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Courses: Geometry Exterior, Transversals