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Plane Geometry
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Demonstrations 901  920 of 1048
Newton's Ellipse
HadwigerFinsler Inequality
Intersection of Two Circles
Einstein's Most Excellent Proof
Circles & Triangles
Pythagorean Analogs for Similar Triangles
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
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