A Beautiful Proof of Ptolemy's Theorem.
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No Calculus Needed?! How to Maximize Range Using Simple Geometry.
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Ptolemy’s Theorem and the Almagest: we just found the best visual proof in 2000 years
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Thales's Theorem
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Cursed Pythagorean Theorem
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A Miraculous Proof (Ptolemy's Theorem) - Numberphile
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The Obviously True Theorem No One Can Prove
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Pythagoras Would Be Proud: High School Students' New Proof of the Pythagorean Theorem [TRIGONOMETRY]
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