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![Go Geometry Education: Orthocenter](h_triangle_center_910.jpg)
Plane Geometry: Circumcircle, Circumradius of a triangle, Theorems and Problems
3
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Circumcircle of a triangle -
Table of Content 3
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![Circumcircle Index](circumcircle_index_1.jpg) |
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![Triangle, Two Altitudes, Circumcircle, Tangent, Parallel](../problem/p774-triangle-circumcircle-altitude-tangent-parallel-1.jpg) |
Geometry Problem 774
Triangle, Two Altitudes, Circumcircle, Tangent at a Vertex, Parallel. |
![Triangle, Circumcircle, Circumcenter, Orthocenter, Midpoint arc, Parallel chord, Congruence](../problem/p770-parallelogram-triangle-circumcenter-angle-bisector-1.jpg) |
Geometry Problem 770
Parallelogram, Angle Bisector, Triangle, Circumcenter, Circumcircle, Angle Measurement. |
![Triangle, Circumcircle, Circumcenter, Orthocenter, Midpoint arc, Parallel chord, Congruence](../problem/p769-triangle-circumcenter-orthocenter-midpoint-arc-parallel-congruence-1.jpg) |
Geometry Problem 769
Triangle, Circumcircle, Circumcenter, Orthocenter, Midpoint of arc, Parallel to chord, Congruence. |
![Equilateral Triangle, Circumcircle, Chord, Harmonic Mean](../problem/p757-equilateral-triangle-circumcircle-harmonic-mean-1.jpg) |
Geometry Problem 757
Equilateral Triangle, Circumcircle, Chords, a Half of Harmonic Mean. |
![Equilateral triangle, Circumcircle, Midpoint](../problem/p755-equilateral-triangle-circumcircle-midpoint-perpendicular-1.jpg) |
Geometry Problem 755.
Equilateral Triangle, Circumcircle, Chord, Arc, Midpoints, Perpendicular. |
![Intersecting Circles, Concyclic points](../problem/p738_cyclic_quadrilateral_1.jpg) |
Geometry Problem
738.
Intersecting Circles, External Common Tangent, Common Chord, Secant, Circumcircle, Cyclic Quadrilateral, Concyclic Points. |
![Triangle, Orthocenter, Circumcircle, Collinear](../problem/p721_altitude_collinear_1.jpg) |
Geometry Problem
721.
Triangle, Orthocenter, Circumcircle, Altitude, Collinear points. |
![Triangle, Altitudes, Parallel, Circumcircle, Angle](../problem/p715_triangle_altitudes_1.jpg) |
Geometry Problem
715.
Triangle, Altitudes, Parallel, Circumcircle, Angle, Measurement. |
![Triangle, Four circumcircles](../problem/p547_triangle_circumcircles.jpg) |
Problem
547.
Triangle, Transversal, Four Circumcircles, Concurrency. |
![Trianglr, Circumcicle, Concyclic](../problem/p702_circles_angles_1.jpg) |
Geometry Problem
702.
Triangle, Circumcircle, Parallel, Concyclic Points. |
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