Dynamic Geometry Problem1463: Parallelogram, Interior Point, Opposite Triangles with Equal Sum of Areas

Interactive step-by-step animation using GeoGebra. Post your solution in the comment box below.
Level: Mathematics Education, High School, Honors Geometry, College.

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Geometry Problem 1394: Three Circles and Three Pair of Common Internal Tangents, Concurrency

Geometry Problem. Post your solution in the comment box below.
Level: Mathematics Education, High School, Honors Geometry, College.

Details: Click on the figure below.

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Geometry Problem 1380: Common Internal Tangents. Circles, Secant, Congruent Chords

Geometry Problem. Post your solution in the comment box below.
Level: Mathematics Education, High School, Honors Geometry, College.

This entry contributed by Markus Heisss, Wurzburg, Bavaria.

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