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Triangles
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Demonstrations 61  80 of 457
Angle and Length Measurement of a Polygon
NinePoint Circle
Parallelogram Dissection Paradox
Sine, Cosine, and Tangent Using Ratios of Sides of a RightAngled Triangle
Square Pyramid and Its Right Triangles
Du Plantier's Square Root Extractor
Incommensurability of the Base and Leg in an Isosceles Triangle
Noble's Square Root Calculator
Triangle Interior Angle Sum by Paper Folding
Area of a Triangle
Periodic Orbit for Acute Triangles
Dougall Theorem II: Inscribed Triangles
Six Triangle Orbits
The Brocard Points and Neuberg Circles of a Triangle
What Triangles Are in the Triangle?
Inscribe a Scaled Copy of a Triangle in Another Triangle
Almost Equilateral Triangles
Generalized Inscribed and Escribed Triangles
Divide Triangles
Fermat Point for Many Points
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