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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
 

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Sketch Art of problem 10

Poster and Typography of Problem 10

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

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

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Last updated: Sep 19, 2016