Circle Equations

Circle Equations

Circle Equations

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Standard forms of equation of a circle

General equation of a circle:The general equation of a circle is x² + y² + 2gx + 2fy + c = 0 where g, f, c are constant.
Central form of equation of a circle: 
The equation of a circle having centre (h, k) and radius r is (x – h)² + (y – k)² = r²

If the centre is origin, then the equation of the circle is x² + y² = r²

CIRCLE EQUATIONS