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![Go Geometry Education](../problem/h_geometry_problem_910.jpg)
Plane Geometry: Open Problems, High School, College
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![Online education degree: Open geometry problems](open_problems_i_1.jpg) |
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![Lester Circle Theorem](../circle/lester-circle-fermat-circumcenter-nine-point-college-1.jpg) |
Geometry Problem 905: Lester Circle Theorem.
Post a solution
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![Geometry Problem 902](../school-college/p902-dynamic-triangle-squares-concurrent-ipad-animation-1.jpg) |
Static Diagram of problem 902
Dynamic Geometry Problem
902
Post a solution
Triangle, Four Squares, Center, Concurrent Lines.
GeoGebra, HTML5 Animation for Tablets
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![Geometry Problem 901](../school-college/p901-circle-common-tangent-secant-circumcircle-concyclic-ipad-animation-1.jpg) |
Static Diagram of problem 901
Dynamic Geometry Problem 901
Post a solution
Intersecting Circles, Common External Tangent, Secant,
Circumcircle, Concyclic Points, Cyclic Quadrilateral.
GeoGebra, HTML5 Animation for Tablets |
![Geometry Problem 894](../school-college/p894-triangle-incenter-60-degrees-midpoint-parallel-html5-ipad-1.jpg) |
Geometry Problem 894
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Triangle, Angle, 60 degrees, Incenter, Midpoint, Parallel Lines.
GeoGebra, HTML5 Animation for Tablets |
![Geometry Problem 893](../school-college/p893-triangle-circumcenter-incenter-circle-collinear-html5-ipad-1.jpg) |
Geometry Problem 893
Post a solution
Triangle, Circumcircle, Incenter, Circle, Tangent, Collinear Points.
GeoGebra, HTML5 Animation for Tablets |
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