Répondre :
MNI = 71 triangle MNI isocèle donc NMI = 71
MIN + MNI + NMI =180
MIN = 180 - 2 x 71 = 38
MIP = 180 - 38 = 142
PMI triangle isocèle donc IPM PMI identique
IPM + PMI + MIP = 180
2 x PMI = 180 - 142 = 38
IPM = PMI = 38 / 2 = 19
MIN + MNI + NMI =180
MIN = 180 - 2 x 71 = 38
MIP = 180 - 38 = 142
PMI triangle isocèle donc IPM PMI identique
IPM + PMI + MIP = 180
2 x PMI = 180 - 142 = 38
IPM = PMI = 38 / 2 = 19