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Gabriela2000
@Gabriela2000
April 2019
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Bonjour j ai un dm a faire pour demain et je n y arrive pas
enoncer: demontrer que l aire du quadrilatere orange est egale au quart de l aire du rectangle ABCD
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Bonjour,
on a 2 triangle rectangle le 1er avec la partie jaune, on l'appelle ADE
le 2eme on l'appelle FDC c'est le petit triangle gris
Aire ADE = [a*(2b/3)]/2 = 2ab/3]/2 = 2ab/6 = ab/3
Aire FDC = [(a/2)*b/3)]/2 = (ab)/6]/2 = ab/12
aire jaune = ab/3 - ab/12
= (4ab-ab)/12 = 3ab/12 = ab/4
Aire ABCD = ab
Aire jaune = ab/4
1 votes
Thanks 3
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on a 2 triangle rectangle le 1er avec la partie jaune, on l'appelle ADE
le 2eme on l'appelle FDC c'est le petit triangle gris
Aire ADE = [a*(2b/3)]/2 = 2ab/3]/2 = 2ab/6 = ab/3
Aire FDC = [(a/2)*b/3)]/2 = (ab)/6]/2 = ab/12
aire jaune = ab/3 - ab/12
= (4ab-ab)/12 = 3ab/12 = ab/4
Aire ABCD = ab
Aire jaune = ab/4