

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.)
See
also:
Sketch Art of problem 10

Poster and Typography of Problem
10






