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Topic: Re: PARCC Definition of Trapezoid
Replies: 1   Last Post: Jun 20, 2013 8:43 AM

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Posts: 127
Registered: 12/3/04
Re: PARCC Definition of Trapezoid
Posted: Jun 19, 2013 7:23 PM
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When I was growing up, I learned that a trapezoid has exactly one pair of
parallel sides, which means a trapezoid is not a parallelogram, so clearly
there is a major difference of opinion on the definition. Ever since I
began teaching Course II, NYS has been quite clear on the definition, which
doesn't necessarily make them the authority on the subject but at least it
provides some level of consistency.

After all, the area of a triangle has the same formula as the area of a
trapezoid and parallelogram.

I also studied the properties of a kite, which doesn't seem to exist
anymore, which is a shame because it offers so many great counterexamples to
misconceptions about quadrilaterals.

Steve Goldman
Half Hollow Hills HS East
Dix Hills, NY

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