Perkins Chen
10/14/2024 · Primary School

XE9 \( A B C D \) un rectangle tel que \( B C=4 \) et \( A B=10 \) 1) calculer la longueur de \( [A C] \) f) \( M \) un point de \( [A B] \) on pose \( A M=x \) vealculer \( B M^{2} ; D M^{2} ; C M^{2} \) en fonction de \( x \). b)déterminer \( x \) tel que \( D M C \) triangle rectangle en \( M^{3} \)

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لحساب طول قطعة \( [A C] \) في المستطيل \( ABCD \) نستخدم نظرية فيثاغورس: \[ A C = \sqrt{10^2 + 4^2} = \sqrt{116} = 2\sqrt{29} \] لحساب \( B M^2 \), \( D M^2 \), و \( C M^2 \) نستخدم المعادلات: \[ B M^2 = 100 - 20x + x^2 \] \[ D M^2 = x^2 + 16 \] \[ C M^2 = x^2 - 12x + 152 \] لتحديد \( x \) بحيث يكون مثلث \( D M C \) مثلثًا قائمًا في \( M \)، نحل المعادلة: \[ x^2 - 8x - 36 = 0 \] حيث \( x = 4 + 2\sqrt{13} \) أو \( x = 4 - 2\sqrt{13} \).

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