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pending

**.** \(D\) is the midpoint of \(BC\)**.** \(DE\) and \(DF\) are drawn perpendicular to \(AB\) and \(AC\) respectively from the point \(D\)**.** \(O\) is the intersection point of \(AD\) and \(EF\)**.** Find the circum-radius of \(\triangle AOF\)**.**

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