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Camille2605
@Camille2605
April 2022
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Pouvez vous m'aider ? Niveau 4ème merci d'avance
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johann4
Bonjour,la somme des angles d'un triangle = 180°donc : x+40 + (3x-17) + 40 = 180donc : 4x + 63 = 180donc : 4x = 180-63 = 117donc : x = 117/4 = 29,25donc : angle ABC = 29,25 + 40 = 69,25° angle BAC = 40° angle ACB = 3 × 29,25 - 17 = 70,75°
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Camille2605
merci
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