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Demonstrations 1 - 20 of 605
First Fermat Point and Isogonic Center of a Triangle
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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
Tetrahedral and Octahedral Similarohedrons
Fermat Point for Many Points
Families of Four-Point Touching Isosceles Triangles
Determining the Area of a Rhombus
Symmetric Independent Families of Four Isosceles Triangles
Families of Four-Point Touching Equilateral Triangles
Bradley's Triangles for a 3-4-5 Triangle
Loyd's Squares for a 3-4-5 Triangle
The Sum of Tangent and Cotangent Is at Least 2
Generating Near-Isosceles Pythagorean Triples
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