In the figure above, two lines are tangent to a circle at points A and B. What is x?

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2015-06-09_1333.png
In the figure above, two lines are tangent to a circle at points A and B. What is x?

(1) The area of the circle is 81π.
(2) The length of arc ADB is 7π.



OA C

Source: Manhattan Prep