Răspunsuri

2014-05-04T10:45:09+03:00
AM=8, MB= 12-8=4 cm.
AM supra AB= AN supra AC
8 supra 12= AN supra 18
AN=18 x 8 :12= 12
ΔABC≈ΔAMN
AB supra AM=BC supra MN
12 supra 8 = 15 supra MN
MN= 15 x8 :12
MN=10 cm

PΔAMN= AM+AN+MN
PΔAMN=8+10+12
PΔAMN= 30 cm
1 5 1