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Plane Geometry
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Demonstrations 21  40 of 1325
Isonona Triangles for 3D Printing
FourPoint Parabolas
First Fermat Point and Isogonic Center of a Triangle
Apollonian Edge Circles
A Visual Proof of Ptolemy's Theorem
Concurrence of the Median, a Chord and a Diameter of the Incircle
A Concurrence Based on Ellipses through the Incenter
Swerve Drive Robot
Center of a Golden Rectangle
Mamikon's Method for the Area under a Parabola
Squares on the Sides of a Quadrilateral
Areas of Squares from the Pedals of a Triangle
Smallest Circle Problem
Center of Gravity of an LShaped Sheet and the Golden Ratio
Mamikon's Method for the Area of the Cycloid
Area of an Inscribed Triangle in Terms of the Product of Its Sides
Observed Distribution of Random Chord Lengths in a Circle
A Circle Defined from an Equilateral Triangle via Pythagoras
Art Gallery Problem
Constructing a Steiner Tree for Five Points
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