Two circles are concentric if they have the same center. Which equation represents a circle that is concentric with
the circle shown but has a radius that is twice as large?
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(x - 4)2 + (- 6)2 = 4
(x-4)2 + (y - 6)2 = 16
(x - 6)2 + (-4)2 = 16
(x - 6)2 + (-4)2 = 4
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