Cho tam giac ABC co AB<AC,phan giac AM. Ten tia AC lay N sao cho AN=AB.Goi K la giao diem cua AB voi MN .CMR:

a)MB=MN

b)tam giac MBK=tam giac MNC

c)AM vuong goc voi KC va BN//KC

d)AC-AB>MC-MB

Lam on lam ho minh vi mai minh phai nop ,xin cam on

Cho canh tam giac abc co ab la 6cm ac la 4cm keo dai ab them doan bm la 2cm keo dai ac them doan cn la 4cm tinh ti so dien tich hai tam giac abmc va bmc

Cho tam giac ABC, biet do dai day BC la 27m , chieu cao AH la 20m . Tren AB lay diem M sao cho Ma = MB . Tren AC lay diem M sao cho BP = PC . Tinh DT tam giac MNP

Luu Y (co ca hinh va cach lam nhe)

cho tam giac ABC co M la giao diem ba duong trung tuyen chung minh rang neu MA=MB=MC thi tam giac ABC deu

cho tam gia abc co m la mot diem bat ki trong tam giac. chung minh: MA+MB+MC

a) lon hon nua chu vi tam giac abc

b) nho hon chu vi tam giac abc

cho tam giac ABC co M la giao diem ba duong trung tuyen chung minh rang neu MA=MB=MC thi tam giac ABC deu

cho tam giac ABC co goc A=90 do ,M la trung diem cua canh AC.Tren tia doi cua tia MB lay diem K sao cho MK = MB. 

a) tam giac AMK = tam giac CMB va AK =CB

b) AK//CB

cho tam giac ABC co AB=AC=20cm .Tren canh AB lay M sao cho MB =8 cm.tren canh AC lay diem N sao cho NC=5cm.noi M voi N;biet dien tich tam giac ABC bang 100 cm3.Tinh s tam giac AMN

cho tam giac deu abc co diem m nam trong tam giác.chung minh ma<mb+mc