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Patricebasilet
@Patricebasilet
May 2019
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Comme me me la fais remarquer Eliott78, une question= 1 problème.
Voici mon exercice que je n'arrive pas a résoudre:
Merci aux personnes qui m'aideront.
Bonne journée
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scoladan
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Bonjour,
En notant x l'angle (HOM) ou (IOM) :
Aire (OMH) = (OH x HM)/2 = cos(x) x sin(x)/2
et Aire (IMH) = (HI x HM)/2 = (1 - cos(x)) x sin(x)/2
On veut Aire (OMH) = 4 x Aire (IMH)
donc :
cos(x)sin(x)/2 = 4 x (1 - cos(x))sin(x)/2
⇔ cos(x) = 4(1 - cos(x))
⇔ 5cos(x) = 4
⇔ cos(x) = 4/5
⇒ x = arccos(4/5) ≈ 36,87°
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Lista de comentários
Verified answer
Bonjour,En notant x l'angle (HOM) ou (IOM) :
Aire (OMH) = (OH x HM)/2 = cos(x) x sin(x)/2
et Aire (IMH) = (HI x HM)/2 = (1 - cos(x)) x sin(x)/2
On veut Aire (OMH) = 4 x Aire (IMH)
donc :
cos(x)sin(x)/2 = 4 x (1 - cos(x))sin(x)/2
⇔ cos(x) = 4(1 - cos(x))
⇔ 5cos(x) = 4
⇔ cos(x) = 4/5
⇒ x = arccos(4/5) ≈ 36,87°