Geometry Problem. Post your solution in the comment box below.

Level: Mathematics Education, High School, Honors Geometry, College.

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## Saturday, February 21, 2015

### Geometry Problem 1087: Tangent Circles, Parallel, 15 Degrees, Angle

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Do you mean ∠COB=15° ?

ReplyDeleteObviously ∠COA=45°.

ReplyDeleteNow 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

ReplyDeleteYes. Thanks