bonjour
AB = 300 m
BC² = 400 ² + 300 ²
BC² = 250 000
BC = √250 000 = 500
BC = 500 m
calcul de CD
CA/CE = CB/CD = AB/DE
400 /1000 = 500 / CD ⇔ CD = 1 250 m
CD = 1 250 m
CA/CE = AB/De
400/1000 = 300 / DE ⇔ 750
DE = 750 m
300 + 500 + 1 250 + 750 = 2 800
parcours = 2 800 m = 2.8 km
