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kamilou73
@kamilou73
June 2021
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EXERCICE DE REFLEXION :
A, B et D sont alignés.
Le triangle ABC est-il isocèle ? Si oui, pourquoi.
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danielwenin
Verified answer
Les angles à la base du triangle isocèle BDC valent (180° - 30°)/2 = 75°
donc l'angle ACB = 75° + 45° = 120°
donc l'angle CAD = 180° - (120° +30°) = 30°
et les angles A et B du triangle CAB valent 30° donc sont égaux et le triangle CAB est isocèle
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Verified answer
Les angles à la base du triangle isocèle BDC valent (180° - 30°)/2 = 75°donc l'angle ACB = 75° + 45° = 120°
donc l'angle CAD = 180° - (120° +30°) = 30°
et les angles A et B du triangle CAB valent 30° donc sont égaux et le triangle CAB est isocèle