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Dot product with circumcenter vector

High school · ●●●○○ 50 pts

In triangle ABCABC, AB=3AB = 3 and AC=5AC = 5. Let OO be the circumcenter of triangle ABCABC. Find OA→⋅BC→\overrightarrow{OA} \cdot \overrightarrow{BC}.

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circumcenterlaw of cosines