University of Georgia
University of Georgia: Inter Math: Exterior Angles
Intermath Dictionary's site defines terms relating to angles, gives examples, and offers interactive exercises.
University of Georgia
University of Georgia: Inter Math: Alternate Interior Angles
This site offers a brief description of alternate interior angles, followed by an explanatory diagram.
The Math League
The Math League: Corresponding Angles
This tutorial provides a definition of corresponding angles and additional information is provided on angles.