

Plane Geometry: Open Problems, High School, College


Open Geometry Problems  Index 3


College Geometry Online


Geometry Problem
1008.
Post a solution
Three Equal Tangent Circles, Sum of Tangent Lines, Tangency Points. 

Geometry Problem
1007.
Post a solution
Hexagon, Midpoint, Triangle, Median, Centroid, Concurrency. 

Geometry Problem 991.
Post a solution
Triangle, Incircle, Tangency Points, Isosceles, Midpoint, Collinearity, Congruence, Circle. 

Geometry Problem 990.
Post a solution
Triangle, Incircle, Median, Cevian, Central Angle, Congruence, Circle, Secant, Midpoint,
Parallel. 

Geometry Problem 988.
Post a solution
Right Triangle, Cevians, Angles, 30 Degrees, Triple Angle. 

Geometry Problem 987.
Post a solution
Triangle, Circumcircle, Incenter, Chord, Parallel, Circle, Tangent. GeoGebra, HTML5 Animation for Tablets (iPad, Nexus). 

Geometry Problem 974.
Post a solution
'Begonia Theorem', Cevian Triangle, Reflection of a point in a line, Concurrency of Lines. GeoGebra, HTML5 Animation for Tablets. 

Geometry Problem 969.
Post a solution
Equilateral Triangle, Rectangle, Common Vertex, Right Triangles Areas. 

Geometry Problem 966.
Post a solution
Triangle, Cevians, Midpoint, Circumcircle, Circle, Tangent Line, Collinear Points. 

Geometry Problem 959.
Post a solution
Triangle, Sides Ratio 4:1, Inradius, Exradius, Cevian, Mean Proportional, Geometric Mean, Metric Relations. 

Geometry Problem 955.
Post a solution
Quadrilateral, Triangle, Diagonals, Triangle, Angles, 30, 40, 60, 70 Degrees. 

Geometry Problem 952.
Post a solution
Triangle, Incenter, Circumcenter, Three Equal Circles, Tangent Line, Tangent Circles, Collinear Points. 
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By Antonio Gutierrez






