Off Topic — HabitableZone

Off Topic » in reply to Ancient brain cell fires...

or is it a pidioid?

By your definition, a cardioid would only have a maximum distance from the fixed circle of D, not pi. So the shape looks llike a cardioid but isn't exactly. (I think) Maybe you could call it a pidioid?

I was wrong with my original answer, I must admit. Looked good at first, but...

(still scratching)

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