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sbikania
@sbikania
January 2021
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Bonjour pouvez vous m'aidez s'il vous plaît merci
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remilesochalieoz9a2c
Verified answer
1) On applique le théorème de Pythagore :
DE² = FE² + FD²
= 4.8² + 1.4²
= 23.04 + 1.96
= 25
DE = √25 = 5 cm
2) a) cos (DEF) = EF/ED = 4.8/5
Avec la calculatrice, tu obtiens DEF ≈ 16°
b) cos (EDF) = DF/DE = 1.4/5
Avec la calculatrice, tu obtiens EDF ≈ 74°
Voilà ! :)
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Lista de comentários
Verified answer
1) On applique le théorème de Pythagore :DE² = FE² + FD²
= 4.8² + 1.4²
= 23.04 + 1.96
= 25
DE = √25 = 5 cm
2) a) cos (DEF) = EF/ED = 4.8/5
Avec la calculatrice, tu obtiens DEF ≈ 16°
b) cos (EDF) = DF/DE = 1.4/5
Avec la calculatrice, tu obtiens EDF ≈ 74°
Voilà ! :)