What is the difference between limacons and cardioids in terms of their shape

I assume that the limacons are the ones with the inner loops and cardioids have no inner loop? Please help!

The limaçon can be generated by specifying a fixed point , then drawing a sequences of circles with centers on a given circle which all pass through . The envelope of these curves is a limaçon. If the fixed point is on the circumference of the circle, then the envelope is a cardioid.

The general shape of limacon is snail like .

Cardioid , as the name suggests is heart like .

http://mathworld.wolfram.com/Cardioid.ht…

http://mathworld.wolfram.com/Limacon.htm…