In AABC, |OG| = 2, |GA| = 3 and |A'O = 4. What is R? (As usual, O is the circumcenter, G is the centroid, A' is the midpoint of

Question

In AABC, |OG| = 2, |GA| = 3 and |A'O = 4. What is R? (As usual, O is the circumcenter, G is the centroid, A' is the midpoint of BC, and R is the circumradius.)

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