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Geometry Problem. Post your solution in the comment box below.Level: Mathematics Education, High School, Honors Geometry, College.Click the diagram below to enlarge it.
Do you mean ∠COB=15° ?
Obviously ∠COA=45°. Now let D be the foot of perpendicular from B to OA. Then BD/OB = CQ/OA = 1/2, thus ∠BOA=30°. Hence, ∠COB=15°.
To Jacob Yes. Thanks