Bonsoir pouvez vous m'aidez je ne comprend pas

4) AENT est un carré dont le périmètre est 56cm.
PAE est un triangle isocèle en P.

a. Calculer AE.
b. Pour quelle longueur de [AP] le périmètre du Pentagone PENTA est-il égal à 60cm? Justifier.

Merci d'avance c'est important

By: USER2697
25 Agustus 2025 mathematiques 5 minutes
4.5
332 views 332 comments 13 shares
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Question

Grade: Education Subject: mathematiques
Bonsoir pouvez vous m'aidez je ne comprend pas

4) AENT est un carré dont le périmètre est 56cm.
PAE est un triangle isocèle en P.

a. Calculer AE.
b. Pour quelle longueur de [AP] le périmètre du Pentagone PENTA est-il égal à 60cm? Justifier.

Merci d'avance c'est important

Asked by:
332 Viewed 332 Answers

Answer (332)

Best Answer
(320)
a.(P=périmètre)
 Pcarré= côté*4
donc AE= PAENT/4
AE=56/4
AE= 14cm

b. pour PENTA= 60cm on a:
AP= (PENTA-(AENT-AE))/2
AP=(60-(56-14))/2
AP=(60-42)/2
AP=18/2
AP=9cm

On vérifie: AT=TN=EN=14 et AP=PE=9
on a donc
PENTA=3*14+2*9 =42+18=60

Answered on 25 Agustus 2025

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