Match the equations with their graphs.
1.
x**2+y**2 = 1
2.
(x-1)**2+y**2=1
3.
x**2+(y-1)**2=1
4.
(x-1)**2+(y-1)**2=1
A
B
C
D
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Hint:
Think of the definition of a circle and the distance formula.
In order to get credit for this problem all answers must be correct.