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Triangles
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Demonstrations 1  20 of 617
Area of a Triangle on an Integer Grid
New this week
GeometricScene Triangle Centers
New this month
Eisenstein Triples
A Visual Proof of Viviani's Theorem
Substitution Tilings
A Lemma in Geometry Concerning Points Generated by the Incircle of a Triangle
Ison Triangles
Dissecting One Isonona Triangle into Two
Isonona Triangles for 3D Printing
Isonona Triangles
Isopenta Triangles
Isohepta Triangles
Recursive Pythagorean Tree
First Fermat Point and Isogonic Center of a Triangle
Concurrence of the Median, a Chord and a Diameter of the Incircle
A Concurrence Based on Ellipses through the Incenter
Areas of Squares from the Pedals of a Triangle
Area of an Inscribed Triangle in Terms of the Product of Its Sides
Visual Derivation of a Trigonometric Identity
A Circle Defined from an Equilateral Triangle via Pythagoras
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