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Negative pedal curve

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Negative Pedal Curves of an Ellipse

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Line-negative-pedal

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Lemniscate-centre-negative-pedal

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Circle-interior-point-negative-pedal

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Gary Holt Signature Pedal from Pro Tone Pedals

In geometry, a negative pedal curve is a plane curve that can be constructed from another plane curve C and a fixed point P on that curve. For each point X ≠ P on the curve C, the negative pedal curve has a tangent that passes through X and is perpendicular to line XP. Constructing the negative pedal curve is the inverse operation to constructing a pedal curve.
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