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Slow Reveal Proof

What do you notice about this figure? What do you wonder about this figure?

Let's add some labels. Now what do you notice and wonder about this figure?

Here is what you are given. Based upon these givens, what do you know for certain, and why? What do you THINK might be true?

Let's take those things that MIGHT be true and try to prove them.

Based upon what you proved, what other statements can you make about the TRAPEZOID?