Réponses

  • Utilisateur Brainly
2014-04-25T15:30:45+02:00
Cos60 =AB/BC
0,5 = 3/BBC
BC = 6

AC² =BC²-AB²
       = 27
AC  = V27 = 3V3

P = 3V3+9

A = (9V3)/2