[Sherry Fraser]

Jim,
Your “proof” seems to be proof by definition. I am a curriculum developer and have been trying to come up with some activity or activities for students that address this standard.
Maybe the authors of the Common Core can tell us why this is a standard, how you prove it, and what you would do in the classroom to prepare students for an assessment item on this standard. Yes, PARCC plans on assessing this standard. Perhaps Bill McCallum, Jason Zimba, or Phil Daro can tell us why this is a standard and how to prove it. Can you help us out here?

[Sherry Fraser]

That explanation sounds like circular reasoning to me. How is that a proof? You state what similar means and then say since they are the same shape, they are similar. Are there any axioms involved? Sorry if I’m being thick, but I really don’t get this.

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