Question

[tran nhat khang1]

cho hinh tam giac ABC , Co AB = 6 cm,AC=4 cm keo dai AB them doan BM = 2 cm, keo dai  AC them doan CN = 4 cm.

a.So sanh S 2 tam giac BMC va BNC

b.Biet S tam giac ABC = 18 cm vuong. Tinh S tam giac AMN