Các câu hỏi tương tự
cho tam giac ABC can tai A, duong cao BH, CK( H thuoc AC,K thuoc AB)
cmr Tam giacBCK dong dang voi tam giac CBH, BH=CK;
KH//BC
neu BC=6cm.AC=AB=5cm,hay tinh do dai HK?
cho tam giac ABC vuong tai A co AB=6cm, AC=8cm. ke duong cao AH cua tam giac ABC(H thuoc Bc0
a) Chung minh tam giac HAB dong dang tam giac HCA
cho tam giac abc vuong tai A (AB<AC). Ke duong cao AH.
A) TAM GIAC AHB dong dang voi tam giac CAB
B) Tu H ke HE vuong goc voi AB(E THUOC AB). Ke HF vuong goc voi AC ( F thuoc AC) CM AE.AB=AF.AC
C) GOI M LA GIAO DIEM CUA EF VA BC. CM GOC MCE = GOC MFB
Cho tam giac ABC duong cao AD,H la truc tam cua tam giac .Lay M bat ki thuoc canh BC .Goi F,E la hinh chieu cua M tren AB,AC Goi I la trung diem cua AM
a,Xac dinh dang cua tu giac
b,chung minh rang cac duong thang MH,ID,EF dong quy
cho tam giac ABC nhon (AB=AC) .ve duong cao BH,BK (H thuoc AC,Kthuoc AB),goi E la giao diem cua BH,CK chung minh a,tam giac ABC ~ tam giac AKC b,KH // BC c,AE cat BC tai I.tinh tong EI/AI+EH/BH+EK/CK=?
cho tam giac ABC, cac duong cao BH va CK
a) chung minh AK*AB=AH*AC
b) Chung minh tam giac AKH dong dang voi tam giac ACB
c) biet AB=20cm, AK=12cm, CK=9cm. tinh S tam giac AKH
d) goi I la diem chuyen dong tren AH, qua A ve AM vuong goc voi BI tai M
chung minh BI*BM+AI*AH=AB2
cho tam giac ABC co AB=5cm,AC=12cm va BC=13cm.ve duong cao AH, trung tuyen AM(H,M thuoc BC)va MK vuong goc voi AC.Chung minh:
a,tam giac ABC vuong
b,tam giac AMC can
c,tam giac AHB dong dang voi tam giac AKM
d, AH.BM=CK.AB
cho tam giac abc vuong tai a duong phan giac bd biet ab = 6 ac =8 tinh ad dc goi k la giao diem cua duong cao ah ba bd chung minh tam giac ahb dong dang voi tam giac cab chung minh abk dong dang voi tam giac bad tu do suy ra ab*bk = bd*hb giup mik voi
cho tam giac ABC co ab=3cm ac=4cm bc=5cm.Duong cao AH(H thuoc BC) tia phan giac goc A cat BC tai D
a) chung minh tam giac ABC dong dang voi tam giac HAC
b)chung minh:AC`2=BC.HC
c)Tinh DB,DC,AH