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Problem 2. Triangle, Angles, Auxiliary Lines.
Level: High School, SAT Prep, College geometry. Prove the following: if, in a triangle
ABC, angle BAO = angle OAC = 20°, angle ACO = 10°,and angle
OCB = 30°, then angle
OBC = 80°.
Post a comment or solution. Try to use elementary geometry (Euclid's Elements.)
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