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Right Triangle -- from Wolfram MathWorld
Right Triangle -- from Wolfram MathWorld
Napoleon's theorem - Wikipedia
The Art of Logic: Triangle incenters for Pythagorean triples
ASSTriangles Wolfram Function Repository
Triangle -- from Wolfram MathWorld
Right Triangle -- from Wolfram MathWorld
First Morley Triangle -- from Wolfram MathWorld
Fourier Series -- from Wolfram MathWorld
ASSTriangles Wolfram Function Repository