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Mathplane Proofs and Postulates Worksheet (with solutions)
Here are some free math videos from yaymath.org
introduction to proofs|algebraic example|transitive vs substitution property|proof examples|
"SAS is not a distress signal" - Webcomic #9 by L. Friedman (12-12-11) (Click lower right corner)
122 - "Proofs" by Spiked Math (12-23-09)