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Triangles
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Demonstrations 121  140 of 519
A Concurrency from Six Pedal Points
Dissecting an Equilateral Triangle into Four Equilateral Triangles
Garfield's Proof of the Pythagorean Theorem
Dudeney's Proof of the Pythagorean Theorem
Sum of Medians Divided by the Perimeter
Primitive Pythagorean Triples on a Curvilinear Grid Defined by Euclid's Formula
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
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