AIR MATH

Math Question

6. The equation \( (x-1)^{2}+(y-3)^{2}=r^{2} \) represents circle \( A \). The point \( B(4,7) \) lies on the circle. What is \( r \), the length of the radius of circle \( A \) ? A. \( \sqrt{13} \) B. 5 C. \( 5 \sqrt{5} \) D. \( \sqrt{137} \)

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