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Triangles
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Demonstrations 141  160 of 554
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
Sum of Medians Divided by the Perimeter
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