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Triangles
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Demonstrations 381  400 of 455
Six Incircles in an Equilateral Triangle
Menelaus' Theorem
Viviani's Theorem
Dudeney's CrosstoIsoscelesRightTriangle Dissection
How the Altitude Divides the Hypotenuse
Dividing a Right Triangle by the Altitude to the Hypotenuse
Dissection of a Triangle to Its Mirror Image II
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
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