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.