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![Go Geometry Education](../geometry/h_online_math_geometry_910.jpg)
Online Geometry: Circles, Theorems and Problems
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Circles - Table of Content
(Page 21)
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![Circles](../geometry/circles_index_17.jpg) |
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![](../problem/p072_circle_secant_17.jpg) |
Proposed Problem
72: Intersecting Circles. Cyclic
quadrilateral, Chords, Parallel.
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![Geometric Art of Triangle Centers, Visual Summary, Delaunay Triangulation, Circular Random Composition, iPad Apps](../center/triangle-centers-visual-summary-circular-random-artwork-1.jpg) |
Geometric art of triangle centers visual summary
Delaunay Triangulation, Circular Random Composition, iPad Apps. |
![](../problem/p071_cyclic_quadrilateral_1.jpg) |
Proposed Problem
71: Cyclic Quadrilateral.
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![](../geometry/schiffler_point_euler_17.jpg) |
Schiffler Point: Four Euler Lines with interactive animation and
manipulation.
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![Artwork of Problem 1174](../school-college/2/p1174-artwork-triangle-angle-circular-dissolve-ipad-apps-1.jpg) |
Artwork of Geometry Problem 1174, Triangle, Angle, Delaunay Triangulation, Circular Random Composition, iPad Apps. |
![](../geometry/feuerbach_points_17.jpg) |
Feuerbach Points and Nine-Point Circle with interactive
animation, manipulation, and step-by-step construction.
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![](../geometry/incenter_excenter_17.jpg) |
Incenter, Excenter, Incircle, Excircle Using TracenPoche Dynamic Software
Step-by-Step construction, Manipulation, and animation. |
![](../geometry/four_circles_concyclic_17.jpg) |
Four Circles
Theorem Using TracenPoche Dynamic Software
Step-by-Step construction, Manipulation, and animation. |
![](../geometry/three_tangent_circles_theo_.jpg) |
Three
Tangent Circles
Theorem Using TracenPoche Dynamic Software
Step-by-Step construction, Manipulation, and animation. |
![](../geometry/three_circles_theorem_17.jpg) |
Three Circles
Theorem Using TracenPoche Dynamic Software |
![Proposed Problem 68](../problem/p068_triangle_incircle_17.jpg) |
Proposed Problem
68: Triangle, Incircle, Inradius, Tangent, Similarity.
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![](../problem/p067_triangle_circumcircle_.jpg) |
Proposed Problem
67: Triangle, Circumcircle, Angles, Cyclic Quadrilateral.
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![](../problem/p066_triangle_excircle_17.jpg) |
Proposed Problem
66: Triangle, Excircle, Tangents, Geometric Mean.
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Sangaku Geometry Theorem: Cyclic Quadrilateral.
Inradii, Rectangle. |
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Email | By
Antonio Gutierrez
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