A miter saw is a wonderful piece of machinery. The ability it has to cut wood at any angle is a boon to do-it-yourselfers when fitting a piece of molding into a tight corner or creating an angled brace. But perhaps something is hindering your ability to cut--leaving the saw's gauge with a limited range of motion. Learn how to get around the problem and cut an obtuse angle.
Set your miter saw to cut at an acute angle and it will cut at an obtuse angle by default.
Determine which acute angle complements the obtuse angle.
Imagine cutting an obtuse angle of 120 degrees as an example.
Note that miter saw gauges don't go to 60.
Set your saw at 30 (90 - 30 = 60) to cut at a 60-degree angle.