01-01-2018
Mathematics

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How to find the angles measures using the law of sines and cosines

How to find the angles measures using the law of sines and cosines class=

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tynollette tynollette

01-01-2018

when the three side lengths are given, use law of cosine;
a²=b²+c²-2bcCosA
exampel: 17²=10²+11²-2*10*11CosA
220CosA=100+121-289=-68
CosA=-68/220
use a calculator to find: A≈107

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