aidez moi svp je n y arrive pas !

on calcule FE :
FE*KL = 6cm²
FE *4 = 6cm²
FE = 6/4 = 1,5cm

on calcule FG :
FG = 4-1 = 3cm

on calcule EG :
EG² = FG²+FE²
       = 3²+1,5²
       = 11,25
EG  = V11,25 ≈ 3,35

(GK)//(EL)

MG/ME = =  MK/ML = GK/EL
MG/3,35 = 1/4
MG*4 = 3,35*1
MG = 3,35/4 = 0,8375 ≈ 0,84cm

EM = EL+GM  =  3,35+0,84 =4,19