Here we take trigonometry to the next level by working with triangles that do not have a right angle. We will work on three key rules. The Sine rule, the Cosine rule and the formula for th area of a triangle. All of these involve linking four...To access the contents of this site, you need to take out a log in or FREE subscription. × Give us feedback Which of the following best describes your feedback? Recommend Report a problem Suggest an improvement Other Name Email address Comments