Geometry Problem 1152: Triangle, Quadrilateral, Angle, 10, 20, 30 Degrees

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

This entry contributed by Sumith Peiris, Moratuwa, Sri Lanka.
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Geometry Problem 964: Right Triangle, Cevians, Angles, 10, 20, 30 Degrees

Geometry Problem
Level: Mathematics Education, High School, Honors Geometry, College.

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Geometry Problem 920: Triangle, Angles, 10, 20, 30 Degrees, Congruence

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

This entry contributed by Erina-NJ.
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Geometry Problem 425: Quadrilateral, Triangle, Angles, 10, 20, 50 degrees, Congruence

Proposed Problem
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Complete Problem 425

Level: High School, SAT Prep, College geometry

Problem 409: Quadrilateral, Diagonals, Perpendicular, Congruence

Proposed Problem
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Complete Problem 409
Level: High School, SAT Prep, College geometry