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08-11-2022
Mathematics

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Des élèves participent à un cross.
Avant l'épreuve, un plan leur a été remis; Il est représenté ci-contre
On peut lire les indications suivantes :
AB=400m ; AC=300m ; l'angle est droit ; BE=2AB
et les droites (BC) et (DE) sont parallèles.
a. Calculer BC

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