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{{video|src=BhClQyV9iSg|title=In this interview Abel describes use of | {{video|src=BhClQyV9iSg|title=In this interview Abel describes the use of GeoGebra for investigating area and perimeter. | ||
|name=Abel Clip 1.m4v|duration= | |||
|series=Abel rectangles | |series=Abel rectangles | ||
|project=OER4Schools | |project=OER4Schools | ||