Asked by Chuck Bass
To use the law of cosines, the length of at least 2 sides must be known.
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GPT-5 mini
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True.
The law of cosines is c^2 = a^2 + b^2 - 2ab cos(C). To compute a side you need the other two sides and the included angle (SAS), and to compute an angle you need all three sides (SSS). In every practical use you must know at least two side lengths.
The law of cosines is c^2 = a^2 + b^2 - 2ab cos(C). To compute a side you need the other two sides and the included angle (SAS), and to compute an angle you need all three sides (SSS). In every practical use you must know at least two side lengths.
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