Bonsoir
MER rectangle en E tel que ER = 60 et MR = 87
1) calculer ME :
MR^2 = ME^2 + ER^2
ME^2 = MR^2 - ER^2
ME^2 = 87^2 - 60^2
ME^2 = 7569 - 3600
ME^2 = 3969
ME = 63
2) calculer la mesure de chaque angle :
MER = 90°
Cos EMR = ME/MR
EMR = arccos ME/MR
EMR = arccos 63/87
EMR ~ 43,6°
MRE = 180 - 90 - 43,6
MRE = 46,4°
