amya57
amya57
13-04-2018
Mathematics
contestada
Find the length a. a=?
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mkryukova19
mkryukova19
13-04-2018
cosine law
a²=b²+c²-2ab*cosA
a²=13²+11²-2*13*11*cos(108)≈378.37
a≈19.45
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