Find the center and the length of a radius of the circle. x 2 + y 2 - 2 x - 6 y + 1 = 0
A) (-1, -3) , r = 3
B) (3, -1) , r = 6
C) (1, 3) , r = 6
D) (3, 1) , r = 3
E) (1, 3) , r = 3
Correct Answer:
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