Formula and description of the perimeter of a parallelogram.
Math Open Reference
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In this Early Edge video lesson, you'll learn more about Transversals and Parallel Lines, so you can be successful when you take on high-school Math & Geometry.
The Princeton Review
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Parallel Lines, and Pairs of Angles
math is fun
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This game (similar to "Who Wants to be a Millionaire") reviews parallel and perpendicular lines and their slopes.
Quia
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This "Jeopardy-like" game reviews basic geometry vocabulary and parallel lines/angles vocabulary
Quia
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