# Math help

**URL:** <https://forum.kirupa.com/t/math-help/313589>\
**Category:** Uncategorized\
**Created:** [September 3, 2010, 2:39pm UTC](https://forum.kirupa.com/t/math-help/313589 "2010-09-03T14:39:54Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![tbo](https://avatars.discourse-cdn.com/v4/letter/t/7feea3/32.png) [@tbo](https://forum.kirupa.com/u/tbo)\
**Post date:** [September 3, 2010, 2:39pm UTC](https://forum.kirupa.com/t/math-help/313589/1 "2010-09-03T14:39:54Z")

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ball overlaps ground  
check 360 points around the circumference of the ball.  
180 points are returned hit, so its 1/2 way in the ground.

balls radius of 20 pixles, how do you calculate how many total pixels are overlapping,assuming a straight surface.

thanks.