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x2 + y2 = 25

A circle with centre (xo, yo) and radius r has equation:

(x - xo)2 + (y - yo)2 = r2

So with centre the origin (0, 0) and radius 5 cm, the circle has equation:

(x - 0)2 + (y - 0)2 = 52

⇒ x2 + y2 = 25

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14y ago

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