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Triangles
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Demonstrations 401  420 of 466
Dissection of a Triangle to Its Mirror Image I
The Area of a Triangle as Half a Rectangle
Spieker Center Triangle Construction
Division of the Opposite Side by an Angle Bisector
Side Lengths Opposite Unequal Angles
Triangles: Scalene, Isosceles, and Equilateral
Triangles: Acute, Right, and Obtuse
A Geometrical Theorem of Leibniz
Dintzl's Law of Cosines Dissection
Hunger's Law of Cosines Dissection
The Perpendicular Bisectors of a Triangle
Addition Formula for Sine
The Ratio Theorem
Calculating the Distance between Two Inaccessible Points
Euler's Triangle Formula
Cyclic Quadrilaterals, Subtriangles, and Incenters
Largest Triangle Inscribed in a Circle
Largest Isosceles Triangle Inscribed in a Circle
Fractal Right Triangle
A Visual Proof of Girard's Theorem
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