this past week in math I learned about triangles and an introduction into trigonometry.  The part I liked the best was, learning shortcuts to finding how many degrees each angle was.  So far all the triangles we have used in our questions and examples have had one right angle being 90 degrees.  Usually we were also given the reference angle.  The shortcuts we learned about were that each triangle has a small medium and large angle, and that all the angles added together should be 180 degrees, if you are given a 90 degree angle you will just have to subtract your reference angle from the 90 degrees left.  No measuring with a protractor needed.