simmetria assiale
asse binario
asse2x
http://www.youtube.com/watch?v=PlbGfZI4OC0&list=PL7AD4C7F76AC3DF09&index=32&feature=plpp_video
asse senario
asse6x
http://www.youtube.com/watch?v=fXKiAbhYJ6g&list=PL7AD4C7F76AC3DF09&index=35&feature=plpp_video
esagos
http://www.youtube.com/watch?v=ye3CQNVyIck&list=PL7AD4C7F76AC3DF09&index=78&feature=plpp_video