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Pablo123
@Pablo123
May 2019
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Bonjour j'ai besoin d'aide pour cette exercice .
Le triangle ABC ci contre est rectangle en A . Calculer y et la longueur de ses 3 cotes sachant que son perimetre est 33,6. (figure en dessous )
Merci
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calinizou
Verified answer
Bonjour
ac²+ab²=cb²
(3y)²+(4y)²=cb²
9y²+16y²=25y²
cb= racine carré de 25y²=5y
périmétre a+b+c=3y+4y+5y=33.6
12y=33.6
y=33.6/12=2.8
donc 3y=3*2.8=8.4
4y=4*2.8=11.2
5y=5*2.8=14
* veut dire multiplier
/ veut dire diviser
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Verified answer
Bonjourac²+ab²=cb²
(3y)²+(4y)²=cb²
9y²+16y²=25y²
cb= racine carré de 25y²=5y
périmétre a+b+c=3y+4y+5y=33.6
12y=33.6
y=33.6/12=2.8
donc 3y=3*2.8=8.4
4y=4*2.8=11.2
5y=5*2.8=14
* veut dire multiplier
/ veut dire diviser