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Plane Geometry
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Demonstrations 101  120 of 1071
NoThreeinLine Problem
Marden's Theorem
Halving the Perimeter of a Zigzag Polygon
Halving the Perimeter of a HeartShaped Curve
The Sum of the First n Odd Numbers
Concave Random Quadrilaterals from Four Points in a Disk
Three Coalescing Soap Bubbles
The Begonia Point
An Application of the GergonneEuler Theorem
Obtuse Random Triangles from Three Parts of the Unit Interval
Obtuse Random Triangles from Three Points in a Rectangle
The Sum of Two CounterRotating Circular Vectors Is an Ellipse
Using Irrational Square Roots to Create Planar Walks
Largest Disk in a Convex Polygon
Polygons on n Vertices
Cross Sections of Three Solids
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
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