Probléme:
on donne BD = 4 cm , BA=6 cm et DBC =60 °
1 montrer que bc=8cm
2 calculer CD . donner la valeur arrondie au 10 eme
3 calculer ac
4 quel est la valeur de tanbac?
5 en deduire la valeur arrondie au degres pres de BAC

















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