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equichordal point
In geometry, an equichordal point is a point defined relative to a convex plane curve such that all chords passing through the point are equal in length. Two common figures with equichordal points are the circle and the limaçon. It is impossible for a curve to have more than one equichordal point.
==Equichordal curves==
A curve is called equichordal when it has an equichordal point. Such a curve may be constructed as the pedal curve of a curve of constant width.〔.〕 For instance, the pedal curve of a circle is either another circle (when the center of the circle is the pedal point) or a limaçon; both are equichordal curves.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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