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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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