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Equidistant

From AoPSWiki

Equidistant means "at the same distance."

Thus, for instance, if triangle \triangle ABC is isosceles with base BC, points B and C are equidistant from point A.

Similarly, the perpendicular bisector of a line segment is the set of points equidistant from the endpoints. So, given segment \overline{AB} and a point C such that AC = BC, we know (by definition) that C is on the perpendicular bisector of \overline{AB}. Also, given C on the perpendicular bisector of \overline{AB}, we know that AC = BC.

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