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Plane Geometry
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Demonstrations 81  100 of 1199
Geometric Solution of a Quadratic Equation Using Carlyle's Circle
The Plemelj Triangle via the Fixed Point of a Transformation
Algebraic Solution of the Plemelj Triangle Construction Problem
Construction of an SSA Triangle
The Double SubdivisionNetwork Method
Roulette (Hypotrochogon) of a Polygon Rolling inside a Circle
Cylindrical Anamorphosis of Some Popular Images
Constructing a Rectangle with the Same Area as a Pentagon
Tarski's Adaptation of Wojtowicz's Argument on Optimal Dissection of a Unit Square
Five Concyclic Points in a Triangle
Triangles with Equal Area Are Equidecomposable (Equivalent by Dissection)
Roulette (Hypotrochogon) of a Circle Rolling inside a Regular Polygon
Dissection and Reassembly of Parallelogram of Given Base and Altitude
Roulette (Hypotrochogon) of a Polygon Rolling inside Another Polygon
Roulette (Epitrochogon) of a Regular Polygon Rolling around Another Regular Polygon
The Nagel Line
Power of a Point Theorem
Roulette (Epitrochogon) of a Disk Rolling around a Regular Polygon
A Visual Proof of Thales's Intercept Theorem
SwingandTwist Hinged Dissection of One Regular Heptagon into Seven
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