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"So, learning math is somewhat like learning to read: we can do it, but it takes time and effort, and requires mastering increasingly complex skills and con- tent. Just about everyone will get to the point where they can read a serious newspaper, and just about everyone will get to the point where they can do high school-level algebra and geometry-even if not everyone wants to reach the point of comprehending James Joyce's Ulysses or solving partial differential equations."

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.

This is a truly amazing site showing sample objects of all scales from Plank's constant to the estimated size of the universe. Amazing interactive site!