Svpl, j'ai un tout petit problème qui me tracasse la tête. Alr j'ai un triangle ABC rectangle en B tel que AB=3cm;Ac=6cm et mesure de l'angle BAC = 60°. Calculer BC

By: USER5194
26 Agustus 2025 brevet 5 minutes
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Grade: Education Subject: brevet
Svpl, j'ai un tout petit problème qui me tracasse la tête. Alr j'ai un triangle ABC rectangle en B tel que AB=3cm;Ac=6cm et mesure de l'angle BAC = 60°. Calculer BC
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Réponse :

Explications :

Bonsoir,

AC² =AB² + BC²

36 = 9+BC²

36-9 = BC²

27=BC²

√27 => 5,2cm = BC

Answered on 26 Agustus 2025
(248)

bjr

l'angle aigu C mesure 90° - 60° = 30°

cos C = côté adjacent / hypoténuse= BC/AC

cos 30° = BC/6

BC = 6 x cos 30°

BC = 6 x √3/2

BC = 3√3  (cm)

(c'est un demi-triangle équilatéral)

Answered on 26 Agustus 2025

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