how do you know whether to use law of sine or law of cosine?

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Guest Nov 20, 2014

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If you remember SSS, SAS, ASA, AAS, SSA (not legal in geometry, but legal in trig) from geometry:

if you have SSS or SAS, use Law of Cosines, otherwise use Law of Cosines.

geno3141 Nov 20, 2014

geno3141 · Answer 1 · 2014-11-20T12:40:51

If you remember SSS, SAS, ASA, AAS, SSA (not legal in geometry, but legal in trig) from geometry:

if you have SSS or SAS, use Law of Cosines, otherwise use Law of Cosines.