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Equation of a circle

Hey,
I'm really confused as to what a "equation of a circle" question would look like on an M1 paper. On the spec it's also referred to as the "cartesian equation"???
(x-a)^2 + (y-b)^2 = r^2
Reply 2
^ when (a, b) is the center and r is the radius of the circle

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Cool thanks :smile:... The spec also says "link to trigonometric functions"?

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