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Sagot :

[tex]\\ \sf\longmapsto cos60=\dfrac{80}{x}[/tex]

[tex]\\ \sf\longmapsto \dfrac{1}{2}=\dfrac{80}{x}[/tex]

[tex]\\ \sf\longmapsto x=80(2)[/tex]

[tex]\\ \sf\longmapsto x=160[/tex]

>> Answer

________

[tex] \: [/tex]

Cos (60°) = 80/x

½ = 80/x

1x = 80•2

x = 160