[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]
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[tex] \: [/tex]
Cos (60°) = 80/x
½ = 80/x
1x = 80•2
x = 160
