Equidistant

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Perpendicular bisector
of a line segment. The point where the red line crosses the black line segment is equidistant from the two end points of the black line segment.
cyclic polygon P is circumscribed
by the circle C. The circumcentre O is equidistant to each point on the circle, and a fortiori to each vertex of the polygon.

A point is said to be equidistant from a set of objects if the distances between that point and each object in the set are equal.[1]

In two-dimensional

n-dimensional space
the locus of points equidistant from two points in n-space is an (n−1)-space.

For a

cyclic polygons: the circumcentre is equidistant from each of the vertices. Likewise, the incentre of a triangle or any other tangential polygon is equidistant from the points of tangency of the polygon's sides with the circle. Every point on a perpendicular bisector of the side of a triangle or other polygon is equidistant from the two vertices at the ends of that side. Every point on the bisector of an angle
of any polygon is equidistant from the two sides that emanate from that angle.

The center of a

is equidistant between two sides.

The center of a circle is equidistant from every point on the circle. Likewise the center of a sphere is equidistant from every point on the sphere.

A parabola is the set of points in a plane equidistant from a fixed point (the focus) and a fixed line (the directrix), where distance from the directrix is measured along a line perpendicular to the directrix.

In shape analysis, the topological skeleton or medial axis of a shape is a thin version of that shape that is equidistant from its boundaries.

In

parallel lines
(lines that never intersect) are equidistant in the sense that the distance of any point on one line from the nearest point on the other line is the same for all points.

In

hypercycle (which is a curve not a line).[2]

See also

References