Question 1186472
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The figure from the given information is of a circle and external point O, with tangent OA and secant OBC.  Given the lengths of OA and BC, the length of OB is easily determined using a basic fact about tangents and secants to a circle:<br>
(OA)^2 = (OB)(OC)<br>
(Note, if you are interested in learning something extra from this.  The formula shown comes from the fact that triangles OAB and OAC are similar.)<br>
Let x be the length of OB and do the calculations; finding the answer will involve solving a quadratic equation.<br>
(NOTE your answer should be an integer....)<br>