Ex 20 seulement svp❤️

MO 13,5 cm
MN 16,22 cm
ON 9 cm

9: cos 40=13,5
(13,5x13,5)+(9x9)=263.25
_
V 263.25 = 16,22


ON :cos 40 =MO
(MOxMO)+(ONxON)=MN
_
V MN = MN