History of Quadrilateral

	Revision 3 . . October 14, 2001 5:52 am by Dreamyshade [picture]
	Revision 2 . . October 14, 2001 5:46 am by Sjn28 [Classification of quadrilaterals]

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Difference (from prior major revision) (no other diffs)

Removed: 11d10

Illustration needed.

Added: 12a12,16

http://www.harcourtschool.com/glossary/math/images/quadrilateral.gif Better illustrations needed.