# Easy math question

**URL:** <https://forum.kirupa.com/t/easy-math-question/55888>\
**Category:** random\
**Created:** [June 28, 2004, 7:59pm UTC](https://forum.kirupa.com/t/easy-math-question/55888 "2004-06-28T19:59:27Z")\
**Posts on this page:** 1\
**Page:** 1

<div class="post-metadata">

**Author:** ![hey\_suburbia](https://avatars.discourse-cdn.com/v4/letter/h/977dab/32.png) [@hey\_suburbia](https://forum.kirupa.com/u/hey_suburbia)\
**Post date:** [June 28, 2004, 7:59pm UTC](https://forum.kirupa.com/t/easy-math-question/55888/1 "2004-06-28T19:59:27Z")

</div>

For some reason, I totally forget how to get the length of a side of an obtuse triangle. For instance this one:

I know the answer is 5.5, but what’s the equation? Thanks