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Plane Geometry
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Demonstrations 881  900 of 1026
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
How Does the Vertex Location of a Parabola Change?
Canonical Polygons
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