Slope of the points (11,-20) and (3,-20)
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so, that's the equation of the circle, and that's its center, any point "ON" the circle, namely on its circumference, will have a distance to the center of 6 units, since that's the radius.
well, the distance from the center to A is 1, namely is "inside the circle".
notice, the distance to B is exactly 6, and you know what that means.
notice, C is farther than the radius 6, meaning is outside the circle, hiking about on the plane.