Các câu hỏi tương tự
CHo tam giac ABC can tai A co goc A la goc nhon. Ve hai duong cao AD va BE cat nhau tai H ( D thuoc BC, E thuoc AC)
a, Cm: Tam giac ABD= tam giac ACD
b, Duong thang CD cat AB tai F. CM; CF la duong cao cua tam giac ABC
c; CM; EF song song BC
cho tam giac abc vuong tai a. tren canh ab lay d, tren canh ac lay e sao cho ad=ae, cac duong thang vuong goc ve tu a va e voi cd cat bc tai g va h. duong thang eh va duong thang ab cat nhau o m. duong thang ve tu a songsong voi bc cat hm tai i. cmr: tam giac acd bang tam giac ame
cho tam giác ABC, 3 đường trung tuyen AD, BE, CF. Tu E ke duong thang song song voi AD cat ED tai I.
a, C/m IC // BE
b, C/m neu AD vuong goc voi BE thi tam giac IC la tam giac vuong
Cho tam giac ABC co AD va BE la cac duong trung tuyen cat nhau tai G. Biet AD=12cm, BD=5cm. Tinh AG,BG
cho tam giac ABC can tai A . duong phan giac GC qua D ve duong thang vuong goc voi CD cat BC tai F . Duong thang ke qua D song song voi BC cat AC tai E . phan giac goc BAC cat DE tai M
CMR CF= 2BD
MD=CF/4
cho tam giac ABC co 3 duong trung tuyen AI,BE,CF cat nhau tai G.Tren tia doi cua tia IA lay M sao cho IM=IG Tren tia doi cua tia EB lay N sao cho EN=EG.TRen tia doi cua tia FC lay P sao cho PF=FG
CMR:
a) tam giac MNP=tam giac ABC
b)G la trong tam cua tam giac MNP
cac ban giup minh nhe minh tick cho .Cam on
Cho tam giac ABC co goc A = 60 do . Cac duong phan giac BD va CE cat nhau tai I . Tren canh BC lay M sao cho BM = BE . a) Chung minh tam giac MID can
b) ve duong thang vuong goc voi BI tai B va vuong goc voi CI tai C , chung cat nhau o K . CMR : 3 diem A,I,K thang hang
Cho tam giac ABC. Hai duong phan giac ngoai ( duong phan giac ngoai la duong phan giac cua goc ngoai tam giac) cat nhau tai I. CMR AI la tia phan giac goc A
1 CHO TAM GIAC VUONG CAN ABC ( AB=AC ) .TIA PHAN GIAC CAC GOC B VA C CAT AC VA AB LAN LUOT TAI E VA D
a) CMR : BE=CD VA AD=AE
b) GOI I LA GIAO DIEM CUA BE VA CD . AI CAT BC O M .CMR CAC TAM GIAC AMB ,AMC LA TAM GIAC CAN
c) TU A VA D VE CAC DUONG THANG VUONG GOC VOI BE ,CAC DUONG NAY CAT BC LAN LUOT TAI K VA H . CMR KH=KC