What is the most likely reason why an author would include a sidebar in his or her report? To expand upon ideas presented in the
main text. To take up space when the author is out of ideas to write. To present new information that is unrelated to the main text. To give the reader the author's opinion of a topic.
Law of Cosines are used when an angle and two sides are given and you have to find for the other side. Law of Sines are used when you need to find the angle of the opposite side.