The writer has found students at various levels who had no clear understanding of the meaning of the Pythagorean theorem. This was brought out in a course, “The Fundamentals of Algebra,” given for in-service teachers, and the professor was immediately confronted with the task of presenting or submitting to these teachers some method of demonstration which would prove more effective than the ordinary approach. The following is one of the several proofs and demonstrations which resulted from this discussion.
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