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Math Geometry Problem 77. Angles in a circle, Cyclic Quadrilateral, Parallel lines. Secant, Chord. Level: High School, College, Mathematics Education

Geometry Problem 40. Triangle, Incenter, Excenter, Angle Bisector, Similarity, Metric relations. Level: High School, College, Math Education.

Geometry Problem 63: Regular Heptagon, side and diagonals. Level: High School, College, Math Education.

Angles, Triangles, and the Start of Geometry in 6th Grade Math! Blog post about some fun new middle school math activities and classroom additions relating to geometry!

Math Geometry Problem 75. Three Intersecting Circles, Secant, Chord, Angle, Cyclic Quadrilateral, Angles. Level: High School, College, Mathematics Education

Dynamic Geometry: Exeter Point, Triangle, Median, Circumcircle, Concurrent Lines, Euler Line, GeoGebra, HTML5 Animation for Tablets (iPad, Nexus, Samsung). Levels: School, College, Mathematics Education.