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1. Dissecting Quadrilaterals

http://www.geogebratube.org/material/show/id/3459 (Download GeoGebra file)

A quadrilateral is dissected by a line joining the mid-points of one pair of
opposite sides, and the perpendiculars to this line from the mid-points of
the other pair of opposite sides.


What shape can you get from this dissection?

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