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Which of the following is a degenerate circle? x^2 + y^2 = 1 x+y = 2...

Which of the following is a degenerate circle?

x^2 + y^2 = 1
x+y = 2
x^2+y^2=-1
(x-4)^2 + (y-2)^2 = 0

Math   Precalculus   
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