# Bouncing a ball in a circle

**URL:** <https://forum.kirupa.com/t/bouncing-a-ball-in-a-circle/130182>\
**Category:** Uncategorized\
**Created:** [December 2, 2004, 6:49am UTC](https://forum.kirupa.com/t/bouncing-a-ball-in-a-circle/130182 "2004-12-02T06:49:54Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![hamidb4](https://avatars.discourse-cdn.com/v4/letter/h/898d66/32.png) [@hamidb4](https://forum.kirupa.com/u/hamidb4)\
**Post date:** [December 2, 2004, 6:49am UTC](https://forum.kirupa.com/t/bouncing-a-ball-in-a-circle/130182/1 "2004-12-02T06:49:54Z")

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Hi,  
How would you define the outline of a circle, if you wanted to throw a ball in it to bounce off the outline. Thanks alot for your help.