Salut !
exercice 10:
COS (EFD) = EF/DF
COS (55°) = EF/ 6cm
EF = 6 × COS(55°) ÷ 1
EF ≈ 3,4cm
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Salut !
exercice 10:
COS (EFD) = EF/DF
COS (55°) = EF/ 6cm
EF = 6 × COS(55°) ÷ 1
EF ≈ 3,4cm