TI89 angle program

<p>Hey everyone. Is there a program for the ti-89, where it will find the angle formed by two lines, if i enter the 2 slopes? I think i had heard about one somewhere, and i'm just trying to be as prepared as i can for math2c, right now i just have the programs on it that came with the calculator. </p>

<p>Thanks alot.</p>

<p>There are lots of programs you can download at <a href="http://www.ticalc.org%5B/url%5D"&gt;www.ticalc.org&lt;/a>. I would imagine that if that program's anywhere, you can find it at that site.</p>

<p>Good luck.</p>