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Plane Geometry
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Demonstrations 121  140 of 1075
Problems on Circles V: External and Internal Common Tangents
Separating Points by a Line or Parabola
Testing a Polygon for Convexity and SelfIntersection
Equal Cores and Shells in Circles and Spheres
An Example of the BolyaiGerwien Theorem
Three Equal Segments from the Altitudes of a Triangle
Ratios Involving Six Radii
Circumcircles of Two Midpoints and an Altitude
Bisecting the Area and Perimeter of a Triangle
Bisecting a Triangle
Three Circles with Two Common Tangents
Reflections of a Line through the Orthocenter in the Sides of an Acute Triangle
Squares on a Line Segment
The Kappa Curve as a Locus
The Trisectrix as the Locus of Points of Intersection
Length of the Projection of a Rotating Polygon
Caustics Generated by Rolling Circles
Paper Size Series A
Hinged Dissection of a Pentagram to a Decagon
Haberdasher's Problem
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