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Plane Geometry
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Demonstrations 881  900 of 1018
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
Watt's Curve
Triangles in the Coordinate Plane
Epitrochoids
Spirograph
Carlyle Circle
An Elliptic Identity
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