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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 solution below

See also: Sketch Art of problem 10

Home | Search | Geometry | Problems | All Problems | Open Problems | Visual Index | 10 Problems | Art | 1-10 | Isosceles Triangle 80-20-80 | Key theorems | Email | 1-100 | by Antonio Gutierrez View or Post a solution Last updated: Sep 19, 2016