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Meilleure réponse !
2013-04-28T18:46:08+02:00

L'angle BCA = 80° en effet

AC/AB = Tg10° => AC = 500.tg10° => AC = 88,163

BC² = AB² + AC² = 257 772,8 => BC = 507,71...

BD/BC = 400/500 => BD = BC.0,8 = 406,17

2013-04-28T18:47:17+02:00