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Choose between the Law of Sines and Law of Cosines
Worksheet
Grade Level
Trigonometry
TRIG.115 Choose between the Law of Sines and Law of Cosines
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A triangular lot has angles A and C known, and side AB known. The target is side BC. Which law should be used after identifying the opposite pair?
A
Law of Sines, because side AB is opposite angle C and side BC is opposite angle A.
B
Law of Cosines, because side AB lies on the drawing.
C
Neither law, because only one side length is known.
D
Law of Cosines first, because the included side is named.
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