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12 cards from this deck
Inside, on, outside
Distance < radius
Distance = radius
Distance > radius
d=(x2−x1)2+(y2−y1)2d = \sqrt{(x_2 - x_1)^2 + (y_2 - y_1)^2}d=(x2−x1)2+(y2−y1)2
x2+y2=r2x^2 + y^2 = r^2x2+y2=r2
r=kr = \sqrt{k}r=k
Inside the circle
On the circle
Outside the circle
Substitution method
Distance comparison method
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