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Triangles
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Demonstrations 361  380 of 442
Euclid's Proof of the Pythagorean Theorem
Simson's Theorem
Stengel's Theorem
Pedal Triangles of Isogonal Conjugates
The Two Triangles Theorem
Euler's Theorem for Pedal Triangles
Distances from the Centroid
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
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