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Equation of a circle:

(x-h)^2+(y-h)^2=r^2

k is the x-coordinate for the centre, h is the y-coordinate for the centre

r=raduis

if the equation is x^2+y^2=r^2, the centre of the circle is at (0,0)

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15y ago

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Q: What is the radius of the center circle?
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