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MrCouscous
@MrCouscous
May 2019
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Bonjour, je n'arrive pas à faire cet exercice :
Dans un triangle JKL rectangle en K on a :
sin J = 12/13
Sin L = 5/13
JK = 5 cm
1. Dessiner ce triangle en vraie grandeur
2. Donner la valeur exacte de Cos J, de Cos L, Tan J et de Tan L
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darkvador103
Verified answer
(1) sin L = JK/JL = 5/JL = 5/13 donc JL = 13 cm.
sin J = KL/JL = KL/13 = 12/13 donc KL = 12 cm.
cos² J +sin²J = 1 donc cos J = √(1-(12/13)²) = √(1-(144/169)) = √(25/169) = 5/13
cos² L+sin²L = 1 donc de même on trouve cos L = 12/13
tan J = sin J /cos J = 12/5
tan L = 5/12
5 votes
Thanks 5
aymanemaysae
Verified answer
Bonjour ;
1)
Veuillez-voir le fichier ci-joint .
2)
cos(J) = cos(π/2 - L) = sin(L) = 5/13 .
cos(L) = cos(π/2 - J) = sin(J) = 12/13 .
tan(J) = (12/13) / (5/13) = 12/5 .
tan(L) = (5/13) / (12/13) = 5/12 .
1 votes
Thanks 0
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Verified answer
(1) sin L = JK/JL = 5/JL = 5/13 donc JL = 13 cm.sin J = KL/JL = KL/13 = 12/13 donc KL = 12 cm.
cos² J +sin²J = 1 donc cos J = √(1-(12/13)²) = √(1-(144/169)) = √(25/169) = 5/13
cos² L+sin²L = 1 donc de même on trouve cos L = 12/13
tan J = sin J /cos J = 12/5
tan L = 5/12
Verified answer
Bonjour ;1)
Veuillez-voir le fichier ci-joint .
2)
cos(J) = cos(π/2 - L) = sin(L) = 5/13 .
cos(L) = cos(π/2 - J) = sin(J) = 12/13 .
tan(J) = (12/13) / (5/13) = 12/5 .
tan(L) = (5/13) / (12/13) = 5/12 .