rence. Complete the figure as in the diagram.Then evidently CK= x - a, KF^ U -^] and [x-af + iy-lf^^r^which is therefore the equation of the circle (§ 8). It will be seen that the preceding equation expressesin algebraic language the characteristic property, orlaw, of the circle, namely, the… … the form as may also be seen at once from the preceding figure.This form of the equation of the circle is the onegenerally used, being the simplest. Cor. 2. If the centre of the circle be at the point(/, 0), then a = r, 6 = 0; and the equation l)ecomes y
Geometry, Analytic
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