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Plane Geometry: Open Problems, High School, College
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Open Geometry Problems - Index 2
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![Geometry problem 1361](../school-college/4/p1361-two-nine-point-circle-angle-tutor-sketch-sw-1.jpg) |
Geometry Problem 1361.
Post a solution
Triangle, Two Nine-Point Circles, Feuerbach's Circle, Euler's Circle, Congruent Angles, Sketch, iPad Apps. |
![Geometry problem 1351](../school-college/4/p1351-circumscribed-tangential-quadrilateral-midpoint-perpendicular-1.jpg) |
Geometry Problem 1351.
Post a solution Two Tangential or Circumscribed Quadrilaterals, Midpoints, Perpendiculars. |
![Geometry problem 1345](../school-college/4/p1345-equilateral-triangle-common-vertex-center-area-1.jpg) |
Geometry Problem 1345
Post a solution Three Equilateral Triangles, Center, Area, Common Vertex. |
![Geometry problem 1325](../school-college/4/p1325-octagon-midpoint-square-math-education-1.jpg) |
Geometry Problem 1325.
Post a solution Octagons, Midpoints, Squares,
Mobile Apps, iPad. |
![Geometry problem 1316](../school-college/4/p1316-triangle-incircle-chord-sum-segment-congruence-1.jpg) |
Geometry Problem 1316.
Post a solution Triangle, Incircle, Tangent, Chord, Midpoint, Sum of two Segments, Congruence. |
![Geometry problem 1282](../school-college/3/p1282-square-midpoint-perpendicular-tutoring-1.jpg) |
Geometry Problem 1282.
Post a solution
Three Squares, Common Vertex, Midpoint, Perpendicular, 90 Degrees. |
![Geometry problem 1253](../school-college/3/p1253-triangle-orthocenter-90-degree-circles-1.jpg) |
Geometry Problem 1253.
Post a solution Triangle, Orthocenter, Circle, Circumcircle, Altitude, Perpendicular, 90 Degree, Concurrency. |
![Geometry problem 1238](../school-college/3/p1238-square-equilateral-triangle-metric-relation-mobile-apps-1.jpg) |
Geometry Problem 1238
Post a solution Square, Equilateral Triangle, Metric Relations. Mobile Apps. |
![Geometry problem 1233](../school-college/3/p1233-orthic-axis-triangle-euler-line-perpendicular-1.jpg) |
Geometry Problem 1233
Post a solution Triangle, Euler Line, Orthic Axis, Perpendicular, 90 Degrees, Orthic Triangle. |
![Geometry problem 1212](../school-college/3/p1212-equilateral-triangle-inscribed-hexagon-concurrency-1.jpg) |
Geometry Problem 1212
Post a solution
Equilateral Triangle, Equilateral Hexagon, Concurrent Lines. |
![Geometry problem 1210](../school-college/3/p1210-circle-tangent-secant-collinear-1.jpg) |
Geometry Problem 1210
Post a solution
Circle, Tangent Line, Secant, Chord, Collinear Points. |
![Geometry problem 1176](../school-college/2/p1176-cyclic-quadrilateral-circle-diameter-collinear-concurrent-1.jpg) |
Geometry Problem 1176
Post a solution Cyclic Quadrilateral, Diagonals, Six Diameters, Circles, Collinear Points, Concurrent Lines. |
![Six Tangential Quadrilaterals Theorem, problem 1175](../geometry/six_quadrilateral_17.jpg) |
Geometry Problem 1175: Six Tangential or Circumscribed Quadrilaterals Theorem
Post a solution
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![Geometry problem 1168](../school-college/2/p1168-arbelos-construction-inscribed-circle-triangle-proof-tutor-1.jpg) |
Geometry Problem 1168
Post a solution Construction of the Inscribed Circle of the Arbelos, Semicircles, Diameter, Circle, Triangle, Circumcircle, Tangent. |
![Geometry problem 1143](../school-college/2/p1143-brain-geometry-triangle-circle-reflection-tangent-1.jpg) |
Geometry Problem 1143.
Post a solution Triangle, Circumcircle, Tangent Line, Reflection of a Point over a Line, Tangent Circles, Collinear Points. |
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By Antonio Gutierrez Last updated: Mar 9, 2022
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