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Triangles
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Demonstrations 1  20 of 605
First Fermat Point and Isogonic Center of a Triangle
New this month
Concurrence of the Median, a Chord and a Diameter of the Incircle
A Concurrence Based on Ellipses through the Incenter
Areas of Squares from the Pedals of a Triangle
Area of an Inscribed Triangle in Terms of the Product of Its Sides
Visual Derivation of a Trigonometric Identity
A Circle Defined from an Equilateral Triangle via Pythagoras
Morley's Theorem
Triangle Centroid
Tetrahedral and Octahedral Similarohedrons
Fermat Point for Many Points
Families of FourPoint Touching Isosceles Triangles
Substitution Tilings
Determining the Area of a Rhombus
Symmetric Independent Families of Four Isosceles Triangles
Families of FourPoint Touching Equilateral Triangles
Bradley's Triangles for a 345 Triangle
Loyd's Squares for a 345 Triangle
The Sum of Tangent and Cotangent Is at Least 2
Generating NearIsosceles Pythagorean Triples
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