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Circles
A circle has a focus which coincides with the center. Since the distance from the center to the focus is zero, the eccentricity of a circle is also zero. The eccentricity is defined as the distance from the center to the focus (zero) divided by the length of the semi-major axis, which is the radius of the circle. Therefore, e = 0 for a circle.
Circles in General Form:Ax˛ + By˛ + Cx + Dy + E = 0 For Circles A = B A & B have to have the same number and same sign.
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