This is a support page for Polar Graphing. Here is review material and polar graph paper. Below are links for further research, and some suggested tasks/questions. 
Cardioid is Greek for "heart."

Limacon is Latin for snail.

Lemniscatus is Latin for "decorated with ribbons" and these look like a figure 8. See Lemniscate at Wikipedia. 
Famous Curves Index at the School of Mathematics and Statistics, University of St Andrews, Scotland! 
© 2019, Agnes Azzolino www.mathnstuff.com/math/spoken/here/2class/300/polar.htm 