What is a good rule to find angles in a right angled triangle?

In any right angled triangle, for any angle:The sine of the angle = the length of the opposite side                        the length of the hypotenuseThe cosine of the angle = the length of the adjacent side                        the length of the hypotenuseThe tangent of the angle = the length of the opposite side                       the length of the adjacent sideSo in shorthand notation:sin = o/h cos = a/h tan = o/aOften remembered by: soh cah toa