Question: Thank you for your help on the attached question. Let AABC be an acute triangle with orthocentre H and circumcentre O. Let A' be the

Thank you for your help on the attached question.

Thank you for your help on the attached question.
Let AABC be an acute triangle with orthocentre H and circumcentre O. Let A' be the midpoint of BC and let D be the foot of the altitude from A. Suppose that HOA'D is a rectangle with HO = 11 and OA' = 5. What is the length of BC

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