amya57
amya57 amya57
  • 13-04-2018
  • Mathematics
contestada

Find the length a. a=?

Find the length a a class=

Respuesta :

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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