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Triangle inequality - Wikipedia
Right Triangle -- from Wolfram MathWorld
The length of a leg of an isosceles right triangle is 5sqrt2. How
Solved Right-Triangle Analysis In analyzing vectors in 2053
Orthocenter -- from Wolfram MathWorld
Circle Inscribing -- from Wolfram MathWorld
Hypotenuse -- from Wolfram MathWorld
Equilateral Triangle -- from Wolfram MathWorld
The Triangle – GeoGebra
Dumb post hole digger question, Page 2