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Triangles
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Demonstrations 61  80 of 466
The Excentral Triangle and a Related Hexagon
Four Concyclic Points
Cross's Theorem
A Concurrency from Midpoints of Arcs of the Circumcircle
A Concurrency of Lines through Points of Tangency with Excircles
Equilateral Triangles in 3D with Integer Coordinates
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
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