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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Parallel Lines and Angles Cut by a Transversal
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mathnstuff
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parallel lines and their uses in geometry
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math for morons like us
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Parallel Lines and Transversals: Equal Angles
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algebra lab
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Definition of alternate exterior angles with a great picture.
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Math Open Reference
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Definition of alternate interior angles with a great picture
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Math Open Reference
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Definition of corresponding angles with a great picture.
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Math Open Reference
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