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pedal equation
For a plane curve ''C'' and a given fixed point ''O'', the pedal equation of the curve is a relation between ''r'' and ''p'' where ''r'' is the distance from ''O'' to a point on ''C'' and ''p'' is the perpendicular distance from ''O'' to the tangent line to ''C'' at the point. The point ''O'' is called the ''pedal point'' and the values ''r'' and ''p'' are sometimes called the ''pedal coordinates'' of a point relative to the curve and the pedal point. Some curves have particularly simple pedal equations and knowing the pedal equation of a curve may simplify the calculation of certain of its properties such as curvature.
==Equations==
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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