Perfect! I prefer this to the "usual" US classification which puts trap's over on the side unconnected to the others. In fact, p'grams do inherit all the (admittedly few) properties of a trap, and a rectangle inherits all the properties of an iso. trap. So why do so many texts take an exclusionary viewpoint? g.
>Here is a classification scheme found in "A Problem Solving Approach to >Mathematics for Elementary School Teachers" by Billstein et al. > > Quadrilateral > / \ > / \ > Kite Trapezoid > | / \ > | / Isosceles > | Parallelogram > | / \ Trapezoid > | / \ / > \ / \ / > Rhombus Rectangle > \ / > \ / > \ / > Square > >Any Comments? > >Tad Watanabe >Towson State University >Towson, Maryland
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