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Sophie32
@Sophie32
April 2019
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AB=√75cm ; AC=4√3cm et BC=√27cm
a. Démontrer que le triangle ABC est rectangle.
b. Écrire le périmètre P du triangle ABC sous la forme a√3 cm (avec a entier relatif) .
c. Montrer que l'aire A, en cm², du triangle ABC est un nombre entier.
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winner123
Verified answer
Bonjour
(4√3)² + (√27)² = 48 + 27 = 75
(√75)² = 75
donc le triangle est rectangle
périmètre = (4 √3 + √27)/ 2 = 4 √3 + 3√3 = 7 /√3 /2
aire = ((4√3 ) ( √27)) /2
= 36 /2 = 18 cm²
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sophie32
merci beaucoup
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Verified answer
Bonjour(4√3)² + (√27)² = 48 + 27 = 75
(√75)² = 75
donc le triangle est rectangle
périmètre = (4 √3 + √27)/ 2 = 4 √3 + 3√3 = 7 /√3 /2
aire = ((4√3 ) ( √27)) /2
= 36 /2 = 18 cm²