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134:. The limiting points themselves can be found at this distance on either side of the intersection point, on the line through the two circle centers. From this fact it is straightforward to construct the limiting points algebraically or by
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produces the other limiting point. An inversion centered at one limiting point maps the other limiting point to the common center of the concentric circles.
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This follows from the pencil definition, together with the fact that every pencil has a unique orthogonal pencil; see
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The two points where the red circles cross are the limiting points of each pair of blue circles
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in the coordinates of the circle centers and their radii is given by
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crosses the line through their centers. This intersection point has equal
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that may be defined by any of the following equivalent properties:
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237:(1): 1–24,
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