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illuminations.nctm.org/LessonDetail.aspx parallelogram sketchpad
illuminations.nctm.org/LessonDetail.aspx quadrilaterals diagonals
www.geogebra.org/...vestigating_Quadrilaterals.pdf quadrilaterals parallelogram investigating
www.cut-the-knot.org/...index.shtml math activities
Geometry Workbook Practice
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lisa kenney
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Updated on Jan 13, 17 Created on Dec 05, 11
Category: Schools & Education
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