Thank you for the opportunity to help you with your question!
It can be solved using the intersecting secant theorem.
If two secant segments are drawn to a circle from an exterior point, then the product of the measures of one secant
segment and its external secant segment is equal to the product of the
measures of the other secant segment and its external secant segment.
Please let me know if you need any clarification. I'm always happy to answer your questions.
Oct 30th, 2015
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