

Plane Geometry: Open Problems, High School, College


Open Geometry Problems  Index 2


Geometry Problem 1361.
Post a solution
Triangle, Two NinePoint Circles, Feuerbach's Circle, Euler's Circle, Congruent Angles, Sketch, iPad Apps. 

Geometry Problem 1351.
Post a solution Two Tangential or Circumscribed Quadrilaterals, Midpoints, Perpendiculars. 

Geometry Problem 1345
Post a solution Three Equilateral Triangles, Center, Area, Common Vertex. 

Geometry Problem 1325.
Post a solution Octagons, Midpoints, Squares,
Mobile Apps, iPad. 

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

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

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

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

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

Geometry Problem 1212
Post a solution
Equilateral Triangle, Equilateral Hexagon, Concurrent Lines. 

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

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

Geometry Problem 1175: Six Tangential or Circumscribed Quadrilaterals Theorem
Post a solution


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

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: Sep 28, 2014






