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Math Forum » Discussions » Math Topics » geometry.pre-college.independent

Topic: Kites: Are rhombuses kites?
Replies: 26   Last Post: Aug 29, 2002 11:49 AM

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Mike de Villiers

Posts: 38
Registered: 12/6/04
Re: Kites: Are rhombuses kites?
Posted: Nov 13, 1997 4:33 AM
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On Tue, 11 Nov 1997, Eileen M. Klimick Schoaff wrote:

> I have encountered two different definitions of trapezoids in textbooks.
>
> 1. Trapezoids are convex quadrilaterals with exactly two parallel sides.
>
> 2. Trapezoids are convex quadrilaterals with two parallel sides.

The inclusive definition 2 is to be preferred for reasons mentioned earlier.

Michael de Villiers

>
> Definition #1 eliminates parallelograms as being a subset of trapezoids.
> Definition #2 would include parallelograms and could be restated as:
> Trapezoids are convex quadrilaterals having as least two parallel sides.
>
> In New York State, we use definitions #1, but encountered #2 in an NCTM
> Addendum book we were reviewing. Talk about controversy!!!
>
> Eileen Schoaff
> Buffalo State College
>
>





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