What is the equation of a circle?

3 years ago

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Hermann Heaney

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(x-a)^2 + (y-b)^2 = r^2, where (a,b) is the coordinate of the centre of the circle and r is the radius. e.g. The equation of a circle with centre (2,-3) and radius 3 is (x-2)^2 + (x+3)^2 = 9

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