1
QuizMultiple Choice
Law of Cosines
Question 1 • NC-Math 4 CR
Bethany used the steps below in an attempt to solve for angle B in triangle ABC. Where is Bethany’s error?
Answer
A
Bethany made one side of the equation equal to the square of the incorrect side when solving for B.B
Bethany took the square root of each squared term before isolating cosB and solving for B.C
Bethany used cosine instead of inverse cosine when finding B.D
Bethany neglected to multiply the expression involving the cosine by 2.