Geometry Problem 1573: Find the Angle at K

Challenging Geometry Puzzle: Problem 1573. Share your solution by posting it in the comment box provided.
Audience: Mathematics Education - K-12 Schools, Honors Geometry, and College Level.

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Geometry Problem 1534: Bike High School Challenge: Tangent Circles, Common External Tangent, and Angle Conundrums

Geometry Problem 1534. Post your solution in the comment box below.
Level: Mathematics Education, K-12 School, Honors Geometry, College.

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Geometry Problem 1470: Tangential Quadrilateral, Incircles, Tangent, Parallel, Rhombus

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 1121 Casey's Theorem. Generalized Ptolemy's Theorem

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

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Geometry Problem 1437: Intersecting Circles, Common Tangent, Equal Product

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

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Geometry Problem 1401: Right Triangle with three circles on the sides, Isosceles, Diameter, Center, Tangent, Congruence

Geometry Problem. 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.

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Geometry Problem 1393: Monge's Circle Theorem, Three Circles and Three Pair of Common Tangents, Collinearity

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

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Poster of Geometry Problem 1380: Common Internal Tangents. Circles, Secant, Congruent Chords, iPad Apps

Geometric Art: Poster, Typography, iPad

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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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Geometry Problem 1379: Common External 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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Typography of Geometry Problem 897: Intersecting Circles, Common External Tangent, Secant, Congruence, iPad Apps

Geometric Art: Typography, iPad

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Geometry Problem 1228: Three Tangent Circles, Midpoint, Major Arc, Common Tangent Line, Square

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

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Geometry Problem 1154 Sangaku Problem: Three circles and a tangent line

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

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Problem 1099 Four Circles, Common External Tangent, Common Internal Tangent, Radius, Metric Relations, Sangaku

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

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Geometry Problem 1098: Circles, Common External Tangent, Common Internal Tangent, Radius, Metric Relations

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

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Problem 1096: Tangent Circles, Common Tangent, Chord, Radius, Center

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

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Problem 1095: Externally Tangent Circles, Common Tangent, Radius, Geometric Mean, Metric Relations

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

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Geometric Art: Sangaku Problem: Three circles and a tangent line

Geometric Art

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Geometry Problem 1093. Square, Circle, Tangent, Radius, Side, Sangaku, Japanese

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

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