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11 cards from this deck
x2+y2+2gx+2fy+c=0x^2 + y^2 + 2gx + 2fy + c = 0x2+y2+2gx+2fy+c=0
(−g,−f)(-g, -f)(−g,−f)
r=g2+f2−cr = \sqrt{g^2 + f^2 - c}r=g2+f2−c
(x−h)2+(y−k)2=r2(x - h)^2 + (y - k)^2 = r^2(x−h)2+(y−k)2=r2
Radius is zero; circle reduces to a point
Equation does not represent a real circle
g2+f2−c>0g^2 + f^2 - c > 0g2+f2−c>0
Circle's centre and radius
Complete the square for xxx and yyy terms
Finding centre and radius from ggg, fff, ccc
standard form
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