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10 cards from this deck
Set of all points at a fixed distance from a fixed point (the centre)
The radius (distance from centre to any point on circle)
x2+y2=r2x^2 + y^2 = r^2x2+y2=r2
Coordinates of any point on the circle
2r2r2r (twice the radius)
C=2pirC = 2pi rC=2pir
A=pir2A = pi r^2A=pir2
Substitute coordinates into equation; if equation holds true, point lies on circle
Compare with standard form to identify r2r^2r2, then take square root: r=sqrtr2r = sqrt{r^2}r=sqrtr2
Fixed point from which all points on circle are equidistant
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