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Historical Mathematics
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Demonstrations 221  240 of 358
Proofs in Multiway Systems
Inscribed and Central Angles in a Circle
Prüfer Codes of Labeled Trees
Distance between Two Points
Angle Bisector Theorem
NoFourInPlane Problem
Pythagorean Triangles with the Same Area
Binary Operators Satisfying Two Axioms
Gödelization
Fermat's Magic Cube
Proposition 3, Book XII, Euclid's Elements
Any Triangle Can Tile
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
The Perpendicular Bisector of a Chord
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