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Triangles
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Demonstrations 181  200 of 590
Cylinder Area Paradox
Dissecting One Equilateral Triangle into Seven
Dissecting an Equilateral Triangle into Three Smaller Ones
Three Equal Segments from the Altitudes of a Triangle
Circumcircles of Two Midpoints and an Altitude
Bisecting the Area and Perimeter of a Triangle
Bisecting a Triangle
Three Circles with Two Common Tangents
Reflections of a Line through the Orthocenter in the Sides of an Acute Triangle
Expanding Triangles Art
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
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