FERMAT 2001 Problem 15

A circle is tangent to the y- axis at (0,2), and the larger of its x- intercepts is 8. The radius of the circle is

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Answer Choices
A. \frac92
B. \sqrt{17}
C. \frac{17}{4}
D. \frac{15}{4}
E. \frac{\sqrt{17}}{2}