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Topic: PARCC Definition of Trapezoid
Replies: 15   Last Post: Jun 19, 2013 9:47 AM

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CCSSIMath

Posts: 47
Registered: 4/24/12
Re: PARCC Definition of Trapezoid
Posted: May 2, 2013 11:23 AM
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Except there is something called an "isosceles trapezoid" (or isosceles trapezium--depending on where you live), which is not a parallelogram, because it has line symmetry.

Either way you think of a trapezoid, it's a question of arbitrary definition, not mathematical principle, which is why we think the inclusion of something so low level as a testable element of Common Core (a trapezoid is first mentioned in 1st grade--will they test that?) is just another of an endless series of dumbed down standards.

Using one definition over the other is also not being honest to students, a practice we abhor.

Sorry to those educators who have to spend time worrying about such issues, which could be time spent on bona fide mathematical questions instead.

Here's a question that involves a trapezoid that doesn't care less what the definition is:
http://fivetriangles.blogspot.com/2013/04/65-paper-cuts.html



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