Các câu hỏi tương tự
Cho tam giac ABC, trung tuyen BM va CN. Biet AB<AC. CM BM<CN
Cho tam giac ABC can tai A .BM va CN la 2 duong trung tuyen BM cat CN tai K
a,Chung minh tm giac BNC =tam giac CMB
b,Chung minh tam giac BKC can tai K
c, Chung minh BC//MN
cho tam giac abc,duong trung tuyen bm va cn cua tam giac abc
a} chung minh tu giac bnmc la hinh thang
b} chung minh mn bang 1/2 bc
cho tam giac abc duong trung tuyen bm va cn cua tam giac abc
a} chung minh bnmc la hinh thang
b} chung minh mn=1/2 bc
c} tinh chu vi hinh thang bnmc biet ab=5cm duong cao ah=3cm
Cho tam giac ABC co goc A bang 90 do. Goi M la trung diem cua canh AC, tren tia BM lay N sao cho M la trung diem cua BN. Chung minh
A) CN vuong goc AC va CN bang AB
B) AN bang BC va AN song song BC
cho tam giac can ABC tai A,co AC bang 8cm,BC bang 9cm.goi giao cua chung tuyen BM va CN la i
CM tam giac MBC bang tam giac NCB
CM Ai la tia phan giac goc BAC
CM Ai vuong goc voi BC
cho tam gic ABC can tai A , A = 50 0 ke trung tuyen BM, CN cat nhau tai H
a so sanh AB, AC BC
b chung minh BM = CN
c tam giac HBC can
d chung minh AH di qua trung diem BC.
cho tam giac ABC co BM va CN la tia phan giac . CMR tam giac ABC cân
Cho \(\Delta\)ABC co AB <AC . BM , CN la 2 duong trung tuyen cua \(\Delta\) ABC CM : BM , CN