A limaçon is a snail curve. The equations
 "r = a \pm b\cos(\theta)")
and
 "r = a \pm b\sin(\theta)")
give to the shape of it when
.
When
, a cardioid is formed. Try to change the values of
a and
b by dragging it. You may also drag the value of
to see the forming of the curve.
Betty, Created with GeoGebra
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