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Sagot :

bonsoir

a)BC=393-251

BC=142m

b)Dans le triangle CBA rectangle en B on a:

sin (CAB)=BC/AC

sin 12°=142/AC

AC=142/sin(12)

AC≈683m

c)tan(CAB)=BC/AB

tan 12°=142/AB

AB=142/(tan12)≈668m

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