MathDB
2014 Guts #30: OI parallel to side

Source:

August 26, 2014
geometrycircumcircleincentertrigonometry

Problem Statement

Let ABCABC be a triangle with circumcenter OO, incenter II, ∠B=45∘\angle B=45^\circ, and OI∥BCOI\parallel BC. Find cos⁡∠C\cos\angle C.
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