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Juliazannol
@Juliazannol
April 2019
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L exercice 2 s il vous plait
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slyz007
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1) Volume=1/3*Aire de la base*Hauteur==1/3*π*3²*8=24π≈75 cm³
2b) On applique thalès :
SB/SA=BP/AR
Donc BP=AR*SB/SA
AR=3 et SB/SA=5/6 donc BP=15/6=5/2=2,5 cm
2c) 1ere manière :
SB=5/6*SA=40/6=20/3
Volume=1/3*Aire de la base*Hauteur=1/3*π*BP²*SB=1/3*π*2,5²*20/3
Volume=125π/9≈44 cm³
2ème manière :
Volume de jus = (5/6)³*Volume du verre=125/216*24π=125π/9≈44 cm³
2d) 1,5 L = 1500 cm³
Donc on peut servir 1500/44≈34 verres.
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Merci beaucoup de votre aide
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Lista de comentários
Verified answer
1) Volume=1/3*Aire de la base*Hauteur==1/3*π*3²*8=24π≈75 cm³2b) On applique thalès :
SB/SA=BP/AR
Donc BP=AR*SB/SA
AR=3 et SB/SA=5/6 donc BP=15/6=5/2=2,5 cm
2c) 1ere manière :
SB=5/6*SA=40/6=20/3
Volume=1/3*Aire de la base*Hauteur=1/3*π*BP²*SB=1/3*π*2,5²*20/3
Volume=125π/9≈44 cm³
2ème manière :
Volume de jus = (5/6)³*Volume du verre=125/216*24π=125π/9≈44 cm³
2d) 1,5 L = 1500 cm³
Donc on peut servir 1500/44≈34 verres.