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Plane Geometry
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Demonstrations 1  20 of 1326
Ruler and Compass Construction of a Square with Doubled Area
New this month
Parallel Lines Have the Same Slope
Midpoint and Centroid Formulas
Wedging an Angle between Two Circles Produces a Limaçon
Centroids of Triangles with Vertices on the Unit Circle
Circle Rolling on a Curve
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
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