Nov.24/09

Today in class we did mental math and then took notes. We took notes on the Law of Sines and Cosines. A main rule in the law of sines is SinA/a, SinB/b and SinC/c. We also learned that to use the law of sines you must have at least one pair. You can only use law of cosines if you know 3 sides but no angles and if you know 2 sides and the included angle. Also you never use the law of cosines more the once in per problem. For homework we got assigned lessons 19 and 25 question one to six.