Bonsoir,
cos = adjacent / hypothenuse
sin = opposé / hypotenuse
tan = opposé / adjacent
Ici l'hypothenuse est CR = 10
tan CRI = CI / RI = 6/8 =0,75
cos CRI = RI / CR = 8 / 10 = 0,8
sin CRI = CI / CR = 6/10 = 0,6
Bonne soirée :D
