Cobweb

[asdf]

How could I make a Cobweb like this one for example?
http://www.google.com/imgres?imgurl=http://elishapeterson.wikidot.com/local--files/technotes:geogebra-cobwebs/cobweb6.jpg&imgrefurl=http://elishapeterson.wikidot.com/technotes:geogebra-cobwebs&usg=__Y3C6fFJni6oQ73CzaLkj7EgN0J4=&h=465&w=598&sz=53&hl=es&start=172&zoom=1&tbnid=Vx-T4hbXiTxaFM:&tbnh=115&tbnw=148&ei=G9RzTYCBL4i28QP_3LD2DA&prev=/images%3Fq%3Dcobweb%26um%3D1%26hl%3Des%26client%3Dubuntu%26sa%3DN%26channel%3Dfs%26biw%3D1366%26bih%3D541%26tbs%3Disch:10%2C2964&um=1&itbs=1&iact=hc&vpx=712&vpy=116&dur=4575&hovh=198&hovw=255&tx=151&ty=117&oei=CdRzTYKUB4iB4QbTreSJDQ&page=8&ndsp=25&ved=1t:429,r:4,s:172&biw=1366&bih=541

[hanst99]

See "How cobwebbing works" in the same article.