Points where perpendiculars from fixed points meet tangent to fixed curve point {pole, pedal curve} make curves {pedal curve}. For parabolas, pedal curves are tangents at vertices. For ellipses or hyperbolas, pedal curves are auxiliary circles. In pedal curves, perpendicular length relates to length from fixed point to curve point {tangent-polar equation} {pedal equation}.
Mathematical Sciences>Geometry>Plane>Curve>Kinds>Set
3-Geometry-Plane-Curve-Kinds-Set
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Date Modified: 2022.0224