Mathematics > Standard Multiple Choice

Read the following SAT test question and then click on a button to select your answer.?

In the figure above, the circle with center A and the circle with center C are tangent at point D. If the circles each have radius 10, and if line??is tangent to the circle with center A at point B, what is the value of X?

(A) 55

(B) 60

(C) 63

(D) 65

(E) It cannot be determined from the information given.

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