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TX-Pre-Calculus
Law of Cosines
Question 7
7
Assignment
Multiple Choice
Law of Cosines
Question 7 • TX-Pre-Calculus
Gabe tried to use the law of cosines to find an unknown angle measure in a triangle. His work is shown. What is Gabe’s error?
Answer
A
Gabe reversed the order of the 9 and the 4.
B
Gabe squared the numbers incorrectly.
C
Gabe should not have subtracted 56 from 16 + 49.
D
Gabe incorrectly stated that cos–1(9) is not defined.
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