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Plane Geometry
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Demonstrations 1  20 of 1321
Circle Rolling on a Curve
New this month
Rolling Circles with Attached Points and Lines
Area of a Triangle on an Integer Grid
GeometricScene Triangle Centers
Eisenstein Triples
Generating an Ellipse Using Steiner's Method
Finding a Tangent Line to a Parabola
The Broken Chord of Archimedes
Cumulative Area under a Cycloid versus the Area of Its Rolling Circle
Penrose Rhombus Tilings by Projecting Golden Rhombi 2
Path of an Ant on the Diameter of a Rolling Circle
A Visual Proof of Viviani's Theorem
Path of an Ant on the Diameter of a Circle Rotating on the Unit Circle
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
FourPoint Parabolas
First Fermat Point and Isogonic Center of a Triangle
Apollonian Edge Circles
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