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Triangles
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Demonstrations 401  420 of 495
A Relation between the Areas of Four Triangles
Three Subtriangles of a Triangle
A Triangle and an External Contact Triangle
Contact Triangles of a Triangle
Tangents to an Excircle
Lines Parallel to the Sides of a Triangle
Mixtilinear Incircles
Area of a Triangle inside the Incircle
Adams' Circle and the Gergonne Point
A Rotating Reuleaux Triangle
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
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