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Triangles
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Demonstrations 381  400 of 466
Cofunction Identities for Sine and Cosine
Incircles and a Cevian
The Midpoints of Two Cevians
The Area of the Contact Triangle
The Minkowski Sum of Two Triangles
Napoleon's Theorem
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
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