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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 53. Tangent Circles, Tangent Chord, Angle Bisector. Level: High School, College, Math Education.

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

Free STEM Websites for Grades 6-12: Middle School and High School

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

Geometry Problem 938: Cyclic Quadrilateral, Triangle, Circumcircle, Circles, Circumcenter, Circumradius, Distance, Metric Relations. School, College, Math Education

My 7th grade math teacher had this exact sign when she taught us. I can never solve these equations without seeing it in my head...even 8 years later!

Geometry Problem 159. Distances from the Circumcenter to the Incenter and the Excenters. Level: High School, College, Mathematics Education.