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Steliner
@Steliner
May 2019
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Bonjour,je suis en 4ème.
Pouvez-vous m'aider à mon exercice mathématiques ?
Si oui.
Je vous remercie d'avance.
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Christine17
Verified answer
AB=5cm
DC=9cm donc EC=4cm
4²+h²=5²
donc h²=25-16=9=3²
h=3
0 votes
Thanks 1
Commentaires
Bonjour,
on sait que DC =9cm
AB = 5cm
⇒EC =9-5 = 4cm
BEC rectangle en B :
on cherche BE
⇒pythagore
BC² = BE²+EC²
5² = BE²+4²
BE² = 5²-4²
BE = √9 = 3cm
⇒
h = 3cm
0 votes
Thanks 0
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Verified answer
AB=5cmDC=9cm donc EC=4cm
4²+h²=5²
donc h²=25-16=9=3²
h=3
on sait que DC =9cm
AB = 5cm
⇒EC =9-5 = 4cm
BEC rectangle en B :
on cherche BE
⇒pythagore
BC² = BE²+EC²
5² = BE²+4²
BE² = 5²-4²
BE = √9 = 3cm
⇒h = 3cm