1. To solve the triangle, would you begin by using the Law of Sines or the Law of Cosines? Explain.
(a)

(b)

2. Use the Law of Cosines to prove each identity.
(a) 1/2 bc (1 +cos A) = a + b + c / 2 ˆ™ -a +b +c / 2
(b) 1/2 bc (1 - cos A) = a - b + c / 2 ˆ™ a + b + c / 2

b = 16 a = 12 C = 18 35 55 B. a = 18