1. Circle
(radius of 5 and center at 0,1)
2. Not a circle
(hyperbola with center at 0,-1)
3. Circle
(radius of 4 and center at -1,2)
4. Circle
(radius of 3 and center at 8,0)
5. Not a circle
(hyperbola with center at 0,0)
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Answers & Comments
1. Circle
(radius of 5 and center at 0,1)
2. Not a circle
(hyperbola with center at 0,-1)
3. Circle
(radius of 4 and center at -1,2)
4. Circle
(radius of 3 and center at 8,0)
5. Not a circle
(hyperbola with center at 0,0)