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Envelope of circles of radius 1/2 centered on an astroid

Author:
Thierry Dana-Picard
Topic:
Circle, Constructions, Curve Sketching, Parametric Curves, Plane Figures or Shapes
The red curve and the green curve are separately envelopes of the family of circles of radius 1/2 centerde on the astroid. Of course, the union of the two componens is also an envelope of the family of circles.

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