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margaux200
@margaux200
June 2021
1
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dimension inconnues
A quelles est la largueur d un rectangle de largeur 3,4 cm et de perimetre 25,2 cm
B quelle est la largeur d un rectangle de longueur 9 cm et d aire 41,4 cm2
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Cabé
Périmètre rectangle = (Longueur + largeur) X 2
P = (L + l)*2
25,2 = (L+3,4)*2
25,2 = 2L + 6,8
2L = 18,4
L = 18,4/2 = 9,2 cm
Longueur = 9.2 cm
Aire du rectangle = Longueur * largeur
41,4 = 9*l
l = 41,4/9
l = 4,6 cm
Largeur = 4.6 cm
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margaux200
merci
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Lista de comentários
P = (L + l)*2
25,2 = (L+3,4)*2
25,2 = 2L + 6,8
2L = 18,4
L = 18,4/2 = 9,2 cm
Longueur = 9.2 cm
Aire du rectangle = Longueur * largeur
41,4 = 9*l
l = 41,4/9
l = 4,6 cm
Largeur = 4.6 cm