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°