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Greek Mathematics
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Demonstrations 41  60 of 84
The Trammel of Archimedes
The SeeSaw Lemma
Da Vinci's Proof of the Pythagorean Theorem
Euclid, Book 3, Proposition 22
A Dissection Proof of Pythagoras's Theorem
Enumerating Pythagorean Triangles
The Eutrigon Theorem
Twin Pythagorean Triples
An Intuitive Proof of the Pythagorean Theorem
Inscribed and Central Angles in a Circle
Distance between Two Points
Pythagorean Triangles with the Same Area
Proposition 3, Book XII, Euclid's Elements
A Lemma of Archimedes about a Bisected Segment
Tangent Points on a Semicircle
Tangent Circles and Parallel Diameters
Perpendiculars to a Chord
Proof of Proposition 28, Book XI, Euclid's Elements
Ptolemy's Theorem
Euclid's Proof of the Pythagorean Theorem
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