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"Drawing Parallel Lines" Parallelogram and Trapezoid Flash Animation Courseware
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"Why Proof" Proof of Parallel Lines PPT Teaching Courseware
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"Comparing the Length of Line Segments" Basic Plane Graphics PPT Courseware 3
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"The Property Theorem and Determination Theorem of Parallel Lines" PPT Courseware 3
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"Sum of Interior Angle Theorem of a Triangle" Proof of Parallel Lines PPT Courseware
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