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Online Geometry Problem 10. Triangle, Angles, 80 and 20 degrees, Congruence, Auxiliary Lines. Level: High School, Honors Geometry, College, Mathematics Education

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In the figure below, AB = CD, angle A = 80 degrees and angle C = 20 degrees. Find x. Try to use elementary geometry (Euclid's Elements.)

 

Proposed Geometry Problem 10, Triangle, Angles
 

See also:
Sketch Art of problem 10

Poster and Typography of Problem 10

Poster and Typography of Problem 10 Triangle, Angles, 80 and 20 degrees, Congruence, Auxiliary Lines.

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Home | SearchGeometry | Problems | All Problems | Open Problems | Visual Index | 10 Problems | Art | 1-10 | Isosceles Triangle 80-20-80 | Key theoremsEmail | 1-100 | by Antonio Gutierrez

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Last updated: Sep 19, 2016