

Plane Geometry: Open Problems, High School, College


Open Geometry Problems  Index 5


College Geometry Online


Geometry Problem 905: Lester Circle Theorem.
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Static Diagram of problem 901
Dynamic Geometry Problem 901
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Intersecting Circles, Common External Tangent, Secant,
Circumcircle, Concyclic Points, Cyclic Quadrilateral.
GeoGebra, HTML5 Animation for Tablets 

Geometry Problem 894
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Triangle, Angle, 60 degrees, Incenter, Midpoint, Parallel Lines.
GeoGebra, HTML5 Animation for Tablets 

Geometry Problem 893
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Triangle, Circumcircle, Incenter, Circle, Tangent, Collinear Points.
GeoGebra, HTML5 Animation for Tablets 
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