cho tam giac ABC can tai A , M la moi\t diem ten canh BC(M ko la trung diem canh BC).qua M ke duong thang song song voi AB cat canh AC tai D, duong thang song song voi AC cat AB tai Ea) Chung minh tam giac MCD can.b) Chung min AE=CD.c ) lay F doi xung voi diem M qua duong thang DE .tu giac ADEF la hinh j ?d) goi K la giao diem cua DF nva AB.Chung minh chu vi tam giacAKD ko phu thuoc vi tri diem M tren canh...
Đọc tiếp
cho tam giac ABC can tai A , M la moi\t diem ten canh BC(M ko la trung diem canh BC).qua M ke duong thang song song voi AB cat canh AC tai D, duong thang song song voi AC cat AB tai E
a) Chung minh tam giac MCD can.
b) Chung min AE=CD.
c ) lay F doi xung voi diem M qua duong thang DE .tu giac ADEF la hinh j ?
d) goi K la giao diem cua DF nva AB.Chung minh chu vi tam giacAKD ko phu thuoc vi tri diem M tren canh BC
