The triangle shown below has side lengths 37, 38, and 39 inches. Which of the following expressions gives the measure of the Iargest angle of the triangle? (Note: For cvery triangle with sides of length a, b, and c that are opposite ZA, ZB, and £C, respectively* a +b-2abcosC.) DO YOUR FIGURING HERE. 38in 39in 37in cos 37'_ 38 39, 2{38)(39) 39'_ 37, _ 38, 2(37)(38) cos cos '137, 38, 39, + 2(38)(39)1 cos '138, 37, 39, + 2(37)(39)1 cos '139, 37, 38, + 2(37)(38)1
