The pedal curve of circle involute
 |  |  | (1) |
 |  |  | (2) |
with the center as the pedal point is the Archimedes' spiral
 |  |  | (3) |
 |  |  | (4) |
Circle Involute Pedal Curve
See also
Circle, Circle Involute, Pedal CurveExplore with Wolfram|Alpha
Cite this as:
Weisstein, Eric W. "Circle Involute Pedal Curve." From MathWorld--A Wolfram Resource. https://mathworld.wolfram.com/CircleInvolutePedalCurve.html