IMAGINE YOU ARE A TOURIST ON VACATION IN A CERTAIN/CITY IN VIET NAM.WRITE A POSCARD TO A FRIEND ABOUT YOUR TRIP.

HELP ME....VIET HAY GIUP MINH NHA!(MAI NOP UI)

choΔABC.ve duong thang song song voi BC ,cat AB tai D va cat AC tai E . qua C ke tia Cx //AB, cat DE tai G.

a, tu giac BDGC la hinh gi ?vi sao

b,cm DA*EG=BD*DE

c,cm ΔABC dong dang ΔCGE

giai nhanh gium minh nha !!!!