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Choose between the Law of Sines and the Law of Cosines
Worksheet
Grade Level
Geometry
GEO.112 Choose between the Law of Sines and the Law of Cosines
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In triangle QRS, angle Q = 64 degrees, side q = 30, and side r = 28. Which first-law choice is best for finding angle R?
A
Law of Sines, because q is opposite Q and r is opposite R
B
Law of Cosines, because two sides are known
C
Pythagorean Theorem, because the side lengths are close
D
Triangle angle-sum theorem, because angle S is not known
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