How do you do sine and cosine? - Answers

It would help if I knew a little more information about what you're looking for, in order to better answer your question, but here are the basics.For a right triangle, given one of the angles that is not the 90° angle:sine is the ratio of the length of the side opposite the angle divided by the length of the hypotenuse.cosine is the ratio of the length of the side adjacent to the angle divided by the length of the hypotenuse.One way to remember this is: Sine, Cosine, Tangent; then think of Old Harry Always Has Old Apples. Sine = O/H, Cosine = A/H, and Tangent = O/A,where O is the Opposite side, A is the Adjacent side, and H = Hypotenuse.Another one that somebody taught me is: Oh Heck Another Hour Of Algebra. Pick whatever helps you to remember.