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ilkou
@ilkou
January 2021
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On considère les points A(3;-1) B(10;-1) C(-1;5)
1- faire une figure et construire le pied K de la hauteur issue de C dans le triangle ABC . Lire la longueur CK
2- calculer la longueur BC
3- calculer l'aire du triangle ABC
4- on note H le pied de la hauteur issue de A . calculer AH
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laurance
1)on lit facilement CK = 6
2)BC² = (-1-10)² +(5+1)² = 11² +6² = 121 +36 = 157 BC=√157
3) aire de ABC = CK * AB /2 = 6 * 7/2 = 21
4)aire de ABC = AH*BC/2 = 21 donc AH = 42 /BC =
42 /√157
2 votes
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2)BC² = (-1-10)² +(5+1)² = 11² +6² = 121 +36 = 157 BC=√157
3) aire de ABC = CK * AB /2 = 6 * 7/2 = 21
4)aire de ABC = AH*BC/2 = 21 donc AH = 42 /BC = 42 /√157