File:Pythagoras by similar triangles.PNG

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Summary

Description	English: A similarity proof for Pythagoras' theorem based upon areas proportional to sides on the center triangle. Area of triangle C = sum of areas of A and B. All three right triangles are similar, so all three areas are proportional to the side bordering the centre triangle. Hence, α(a² + b²) = α c², or dividing by α, we have Pythagoras' theorem.
Date	28 May 2010
Source	Own work
Author	Brews ohare

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