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Problem 1087: Tangent Circles, Parallel, 15 Degrees, Angle
Level: High School, College, Math Education

The figure below shows the circles of centers O and Q tangent at A. BC is tangent to circle Q at C and parallel to OA. Prove that angle COB = 15 degrees.

$Geometry Problem 1087 Tangent Circles, Parallel, 15 Degrees, Angle$

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