http://www.intmath.com/plane-analytic-geometry/conic-sections-summary.php
General Form of the Circle
An equation which can be written in the following form (with constants D, E, F) represents a circle:
x2 + y2 + Dx + Ey + F = 0
Formal Definition A circle is the locus of points that are equidistant from a fixed point (the center).
Conic Section
If we slice one of the cones with a plane at right angles to the axis of the cone, the shape formed is a circle.
Class we are not covering conic sections. So, we will regard this as extra info. Not required for test!
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