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Plane Geometry
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Demonstrations 961  980 of 1102
Wittenbauer's Parallelogram
Tension in a Hanging Chain
Delannoy Path Exhaustion Diagonal
Lattices in Perspective
Circumcircle and Incircle of a Triangle
OneSided Polyominoes
Reflection in Two Dimensions
Rotation in Two Dimensions
How Tall Is That Building?
Indestructible Perpendicular Lines
Hippias Quadratrix
Toroidal Wrapping
Spiral Explorer
Dissection Fallacy
How Does the Vertex Location of a Parabola Change?
Canonical Polygons
Carnot's Theorem
Passive Sonar
Circle Covering by Arcs
Rolling a Coin around a Coin
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