Use the Law of Cosines to determine the indicated side x Ass

Use the Law of Cosines to determine the indicated side x. (Assume b = 15 and c = 17. Round your answer to one decimal place.)

180 degress is the angel A

Solution

Cosine law

a^2 = b^2+c^2-2bc cos A

a^2 = 15^2+17^2-2*15*17* cos 180

cos 180 = -1

a^2 = 15^2+17^2+2*15*17

a^2 = 1024

a = 32