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     EduGorilla 
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    The equation ax2 + by2 + 2hxy + 2gx + 2fy + c = 0 represents a circle, if

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    1. a = b, h = 0
    2. a = b  0, h = 0 
    3. a = b  0, h = 0, g2 + f2 - c > 0
    4. a = b  0, h = 0, g2 + f2 - ac > 0
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