Jamal Gholami - Department of Mechanical Engineering, Bahonar Technical and Engineering College,Shiraz, Iran
Nazem Habibpour - Department of Mechanical Engineering, Bahonar Technical and Engineering College,Shiraz, Iran
Maryam Kamrannia - ZAND INSTITUTE OF HIGHER EDUCATION , SHIRAZ, IRAN

In this paper, a classical chaos study has been presented in a circular and stadium billiard. by usingangular momentum parameter and coordination of collision particles with billiard boundary, chaoshas studied in circular and stadium billiard. In the next step, entropy has introduced for consideringchaos in billiards.

Billiard ,stadium billiard, circular billiard, angular momentum, entropy