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english Using just basic geometry prove that: a·a’=b·b’+c·c’
francais Démontrer que: a·a’=b·b’+c·c'
italiano Dimostrare che: a·a’=b·b’+c·c'

Sunday puzzle 43

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Text and images by Gianni A. Sarcone 
Labels: SUNDAY PUZZLE, puzzles to solve, recreational mathematics, triangles, trapezoids
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