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Some shameless self-advertising, and probably of interest only to math logic & curriculum wonks, but I believe there is a good argument for using a more inclusive definition of trapezoids.

Published Online: September 1, 2011 By Allan Odden and Lawrence O. Picus, Phi Delta Kappan Education budgets are imploding at the fiscal seams. A sluggish economy and falling property values are shortchanging public education budgets across the country. At the same time, there are growing expectations for improved student performance, better teachers and closing the achievement gap. Interesting article about changing the face of schools and teacher performance in the absence of or with declining revenues. A good article to review with some other good resources.