If it looks like the above, and you want angle A then on your TI-84 calculator, press 2ND TAN 28/11 so that you see this: tan-1(28/11) press ENTER Write down what you see and put a degree mark o after it. That will be angle A. If you then want angle B, subtract angle A from 90o. -------------------------------------------------------------- If it looks like the above, and you want angle A, then on your TI-84 calculator, press 2ND COS 11/28 so that you see this: cos-1(11/28) press ENTER Write down what you see and put a degree mark o after it. That will be angle A. If you then want angle B, subtract angle A from 90o. Edwin