3
QuizMultiple Choice
Law of Cosines
Question 3 • NC-Math 4 CR
A ship heads due north for x miles, then turns 25° east of north and travels for another y miles. Which expression represents the distance the ship is from the original starting point?
Answer
A
x plus y minus StartRoot 2 xy cosine 155 degree EndRoot.
B
StartRoot x squared plus y squared minus 2 xy cosine 155 degree EndRoot.
C
x plus y minus StartRoot 2 xy cosine 25 degree EndRoot.
D
StartRoot x squared minus y squared minus 2 xy cosine 25 degree EndRoot.