Online Math: Geometry: Open Problems, High School, College

Geometry: Open Problems

Problem 1335. The Lune of Hippocrates has the same area of a Kite.
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Geometry Problem 1325.
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Octagons, Midpoints, Squares, Mobile Apps, iPad.

Geometry Problem 1320.
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Triangle, Incircle, Tangent, Chord, Circle, Parallel, Perpendicular, Collinearity.

Geometry Problem 1319.
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Hexagons, Equilateral Triangles, Center, Midpoints.

Geometry Problem 1317.
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Triangle, Excircle, Chord, Tangent, Midpoint, Arc, Sum of two Segments, Congruence.

Geometry Problem 1316.
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Triangle, Incircle, Tangent, Chord, Midpoint, Sum of two Segments, Congruence.

Geometry Problem 1315.
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Triangle, Incircle, Tangent, Chord, Circle, Congruence.

Static Diagram of problem 902
Dynamic Geometry Problem 902
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Triangle, Four Squares, Center, Concurrent Lines. GeoGebra, HTML5 Animation for Tablets

Geometry Problem 1301.
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Arbelos, Semicircles, Diameters, Circle, Incircle, Incenter, Square, Midpoint, Concurrency.

Geometry Problem 1298.
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Arbelos, Semicircles, Diameters, Circle, Incircle, Tangent, Angle Bisector, Perpendicular, Midpoint.

Geometry Problem 1282.
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Three Squares, Common Vertex, Midpoint, Perpendicular, 90 Degrees.

Geometry Problem 1253.
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Triangle, Orthocenter, Circle, Circumcircle, Altitude, Perpendicular, 90 Degree, Concurrency.

Geometry Problem 1238
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Square, Equilateral Triangle, Metric Relations. Mobile Apps.

Geometry Problem 1233
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Triangle, Euler Line, Orthic Axis, Perpendicular, 90 Degrees, Orthic Triangle.

Geometry Problem 1212
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Equilateral Triangle, Equilateral Hexagon, Concurrent Lines.

Geometry Problem 1210
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Circle, Tangent Line, Secant, Chord, Collinear Points.

Geometry Problem 1176
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Cyclic Quadrilateral, Diagonals, Six Diameters, Circles, Collinear Points, Concurrent Lines.

Geometry Problem 1175: Six Tangential or Circumscribed Quadrilaterals Theorem
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Geometry Problem 1169
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Complete Quadrilateral, Orthocenters of the Component Triangles, Collinear Points, Ortholine, Steiner-line, Orthocentric line.

Geometry Problem 1168
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Construction of the Inscribed Circle of the Arbelos, Semicircles, Diameter, Circle, Triangle, Circumcircle, Tangent.

Geometry Problem 1163.
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Isosceles Triangle, Congruence, Double Angle, Circle, Concyclic Points, Circumcenter, Perpendicular, Angle Bisector.

Geometry Problem 1145.
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Three Squares, Midpoints.

Geometry Problem 1143.
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Triangle, Circumcircle, Tangent Line, Reflection of a Point over a Line, Tangent Circles, Collinear Points.

Geometry Problem 1142.
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Cyclic Quadrilateral, Isogonal Lines, Circle, Center, Radius, Perpendicular Bisector, Circumcenter.

Geometry Problem 1140.
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Triangle, Circumcircle, Circle, Center, Collinear Points.

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