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AgentGenial
@AgentGenial
May 2019
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Bonjour, j'ai besoin d'aide svp. Merci de bien détailler vos calculs. Je vous remercie d'avance !
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Bonjour,
1) réciproque thales : si EB/ED = EA/EC , (AB)//(CD)
tu as les mesures, calcule, conclus
2) (AB)//(CD)
thales
EB/ED = EA/EC =AB/DC
calcule AB :
EB/ED = AB/DC
remplace par les valeurs connues, calcule DC
3) (CE) et (ED) ⊥ si DC² = ED²+EC², EDC rectangle en E
réciproque pythagore,
calcule DC² =...
ED²+EC² = .....
conclus
4a) eCd = EC/DC = 12/15= 0,8
eCd = 36,896 soit 37°
b) (AB)//(DC)
⇒eAb=eCd (voir cours sur les angles appris en 4eme)
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Verified answer
Bonjour,1) réciproque thales : si EB/ED = EA/EC , (AB)//(CD)
tu as les mesures, calcule, conclus
2) (AB)//(CD)
thales
EB/ED = EA/EC =AB/DC
calcule AB :
EB/ED = AB/DC
remplace par les valeurs connues, calcule DC
3) (CE) et (ED) ⊥ si DC² = ED²+EC², EDC rectangle en E
réciproque pythagore,
calcule DC² =...
ED²+EC² = .....
conclus
4a) eCd = EC/DC = 12/15= 0,8
eCd = 36,896 soit 37°
b) (AB)//(DC)
⇒eAb=eCd (voir cours sur les angles appris en 4eme)