Question

What is the general form of the equation of a circle with center at (a, b) and radius of length m?

Answer 1

the equation of any circle can be expressed in the form x2 + y2 + 2gx + 2fy + c = 0. This is of the form (x - h)2 + (y - k)2 = r2 which represents a circle having centre at (- g, -f) and radius √g2+f2−c.

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