The pedal curve of an astroid
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(1)
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(2)
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with pedal point at the center is the quadrifolium
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(3)
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(4)
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Astroid Pedal Curve
See also
Astroid, Pedal Curve, QuadrifoliumExplore with Wolfram|Alpha
Cite this as:
Weisstein, Eric W. "Astroid Pedal Curve." From MathWorld--A Wolfram Web Resource. https://mathworld.wolfram.com/AstroidPedalCurve.html