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Ss07ss03
@Ss07ss03
May 2019
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Bonjour pouvez-vous m'aider sur se devoirs svp:
dans un triangle JKL,rectangle en K,on a:
sin J=12/13
} et JK=5cm
sin L=5/13
donner la valeur exacte de cos J , de cos L de tan J et tan L
merci (:☆
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Commentaires (2)
bonsoir ^^
(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
voilà ^^
1 votes
Thanks 1
croisierfamily
notre Scientifique Marinette aurait dû utiliser sin(â) = cos(angle complémentaire) ... cela semble plus simple ! Remarque : tan(J) = 2,4 puisque 12/5 tombe "juste" .
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Lista de comentários
(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
voilà ^^