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Plane Geometry
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Demonstrations 121  140 of 1083
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
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
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