Réponses

2014-06-03T23:38:22+02:00
Cos 38°=0,79
cos 38°=PK/PL=0,79
Donc PL=PK/0,79=3/0,79
PL=3,79cm=37,9mm

cos32°=0,84=RL/PL
0,84=RL/3,79
RL=0,84x3,79=3,18cm=31,8mm