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palmerbryan69
@palmerbryan69
January 2021
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Bonsoir,
merci d'avance.
(TRÈS URGENT)
je reposte car ma question a été supprimé...
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trudelmichel
Verified answer
Bonjour,
triangle rectangle CBDen D
cosinus dbc=DB/CB
cosinus 60°=4/CB
0.5=4/CB
CB=8
triangle rectangle ACB en B
AC²=AB²+CB²
AC²=6²+8²
AC²=36+64
AC²=100
AC=10
cosinus bac =AB/AC
cosinus BAC =6/10=0.6
angle BAC=53°
triangle ACB
AB²=CD²+DB²
8²=CD²+16
64-12=CD²
52=CD²
CD=7.2
Aire ABCD=Aire ABC +Aire CDB
Aire ABC=1/2(AB x BC)=1/2(6x8)=1/2(48)=24
Aire CDB=1/2(CDx db)=1/2(7.2x8)=1/2(57.6=28.8
Aire ABCD=24+28.8=52.8
1 votes
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Bonjour a tous Excellente soiree Merci d'avance pour votre reponse
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Bonjour URGENT merci d'avance.
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Lista de comentários
Verified answer
Bonjour,triangle rectangle CBDen D
cosinus dbc=DB/CB
cosinus 60°=4/CB
0.5=4/CB
CB=8
triangle rectangle ACB en B
AC²=AB²+CB²
AC²=6²+8²
AC²=36+64
AC²=100
AC=10
cosinus bac =AB/AC
cosinus BAC =6/10=0.6
angle BAC=53°
triangle ACB
AB²=CD²+DB²
8²=CD²+16
64-12=CD²
52=CD²
CD=7.2
Aire ABCD=Aire ABC +Aire CDB
Aire ABC=1/2(AB x BC)=1/2(6x8)=1/2(48)=24
Aire CDB=1/2(CDx db)=1/2(7.2x8)=1/2(57.6=28.8
Aire ABCD=24+28.8=52.8