Also known as araneidan, this curve owes its name to its spider-like shape. It is given by the polar equation
![r=a(sin(ntheta))/(sin[(n-1)theta]),](/images/equations/Arachnida/NumberedEquation1.svg) |
where 
and 
is an integer (right figure). An alternate version of
the araneidan has the slightly different polar equation
![r=a(sin(ntheta))/(sin[(n+1)theta]),](/images/equations/Arachnida/NumberedEquation2.svg) |
where 
and 
is an integer (left figure).
