Réponses

2014-06-09T15:37:53+02:00
Bonjour

Figure a

cos(56°) = Ub/4
Ub = 4 x cos(56) = 2.2 cm

Figure b : tu fais pareil, je ne lis pas bien l'angle
c) BU = 4.3 x cos(22) = 4

d) Bu x cos(38) = 2.25
BU = 2.25 : cos(38) = 2.6 cm