An interactive applet showing the way the angle values change but the relationship between angle pairs does not.
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Saltire Software Geometry Gallery
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This tutorial focuses on the properties and proofs surrounding trapezoids with a closer look at medians in trapezoids, with solid diagrams and detailed verbal descriptions.
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Think Quest
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This game (similar to "Who Wants to be a Millionaire") reviews parallel and perpendicular lines and their slopes.
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Quia
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A discussion of using a linear equation to determine properties of lines.
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Ask Dr. Math
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A discussion of parallel lines in a triangle proof.
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Ask Dr. Math
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This tutorial works through the different types of quadrilaterals and their characteristics in a self-paced manner with detailed explanations and solid diagrams.
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Think Quest
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This gives detailed examples of finding the angles in parallel lines and proving lines parallel in a self-paced fashion.
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Think Quest
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This "Jeopardy-like" game reviews basic geometry vocabulary and parallel lines/angles vocabulary
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Quia
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This gives step by step instructions on constructing a line parallel to another line through a point includes a JavaSketchpad for interaction.
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To draw a line through a given external point parallel to a given line.
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Parallel Lines, and Pairs of Angles
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math is fun
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