Second Look - Geometric Proof
Playing with Dominos: Proof by Induction
February 2009, Volume 102, Issue 6, Page 426 - Mathematics Teacher
Key Ideas and Insights in the Context of Three High School Geometry Proofs
May 2006, Volume 99, Issue 9, Page 644 - Mathematics Teacher
Sherlock Holmes, Geometry Proofs, and Backward Reasoning
May 2006, Volume 99, Issue 9, Page 544 - Mathematics Teacher
Pieces of Proof
Illuminations Lesson:
An intermediate step between understanding postulates and theorems in
geometry and writing proofs using them. Students put together the
statements and reasons to build a formal proof.
Principles and Standards for School Mathematics
Reasoning and Proof Standard for Grades 9-12
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