salut
a) cos60°= DB/BC= 4/BC
BC*cos 60°= 4
BC= 4/cos 60°
BC=8
b) sin 60°= CD/BC=CD/8
sin 60°*8= CD d'ou CD= 6.93
c) AC²= AB²+BC²
= 6²+8²
= 100
AC= racine (100) AC =10
d) tgte BAC = BC/AB= 8/6
e) tgte BAC = 53.13°
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salut
a) cos60°= DB/BC= 4/BC
BC*cos 60°= 4
BC= 4/cos 60°
BC=8
b) sin 60°= CD/BC=CD/8
sin 60°*8= CD d'ou CD= 6.93
c) AC²= AB²+BC²
= 6²+8²
= 100
AC= racine (100) AC =10
d) tgte BAC = BC/AB= 8/6
e) tgte BAC = 53.13°