Formula and description of the perimeter of a parallelogram.
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Math Open Reference
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A discussion of proving lines parallel using slope and transverse lines.
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Ask Dr. Math
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A discussion of the proof involving parallel lines and alternate angles.
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Ask Dr. Math
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Shows definitions of parallelograms and their angles. Also shows two sample proofs.
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Regents Prep
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A helpful scientific calculator that runs in your web browser window.
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Holt Online Learning
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This site outlines the theorems about parallelograms with proofs to these theorems.
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Steve Wilson of Sonoma State University
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A page with links for properties of circles and different types of polygons. Each link has great visuals with clear markings, definitions, and formulas.
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Cool Math
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Students get confused on the definitions of the different angles associated with parallel lines. This website defines them in a pictorial way and allows the students to move the lines around to see that the angles are still equal.
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Manipula Math Applet Collection
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This interactive quiz allows you to test your knowledge on complementary and supplementary angles, as well as all the special angle pairs with the transversal of parallel lines.
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Mr. Martini's Classroom
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