Các câu hỏi tương tự
Cho tam giac ABC co AB= AC. Tia phan giac cua goc BAC cat BC tai D
CMR Tam giac ABD = tam giac ACD
Tren tia doi cua tia AD lay E sao cho AE=AD va tren tia doi cua tia AB lay F sao cho AF=AB CMR EF=BD
Goi H la trung diem cua FC. Cmr AH la tia phan giac cua goc CAF
CMR AH//BC
Giai giup minh som nhat, chi tiet nhat, minh cho 5 sao!!!!
Cho tam giac ABC co AB < AC , duong phan giac AD ( D thuoc BC ) > Tren canh AC lay diem E sao cho AB = AE . Duong thang ED cat tia AB tai F . Chung minh rang :
1 BD = DE
2AD vuong goc voi FC
3 Goi M la giao diem cua AD va FC . Chung minh EM < \(\frac{EF+EC}{2}\)
cho tam giac abc vg tai a (ab<ac),tren canh bc lay diem d sao cho ba=bd.Ke bh vg goc voi ad .a,c.m tam giac abd can va tam giac ah b =tam giac dhb.b, tren tia doi cua tia ab lay diem e sao cho ae =dc.c/m tam giac bde = tam giac bac
Tam giac ABC co AC > AB , tia phan giac cua goc A cat BC o D . Tren AC lay diem E sao cho AE = AB . Chung minh rang AD vuong goc BE.
Cho ∆ABC (AB<AC). Phan giac AD(D€BC) tren canh AC lay diem E sao cho AB=AE. Tren tia ED cat AB tai K
Chung minh BD=DE
DKC=DCK
AD vuong goc voi KC
Cho tam giac ABC vuong tai A, Phan giac BD (D thuoc AC). que D ke duong thang vuong goc voi BC tai E
1, Chung minh tam giac ABD= tam giac EBD
2, Chung minh BD vuong goc voi AE
3, CHung minh AD be hon DC
4, Tren tia doi cua tia AB lay diem F sao cho AF= CE. Chung minh ba diem E,D,F thang hang
cho tam giac ABC , M la trung diem tren AC . Tren tia doi cua tia MB lay diem D sao cho MD = MB . Ve CE vuong goc AD tai E . Goi F la diem nam tren canh BC sao cho BF = DE . Chung minh rang:
a) tam giac ABC = tam giac CDA
b) AF vuong goc voi Bc
c)M,E,F thang hang
cho tam giac ABC co AB be hon AC, AD laf tia phan giac cua goc BAC(D thuoc BC). Tren canh AC lay diem E sao cho AE=AB.C/m rang tam giac ABD=tam giac AED, CD lon hon DB
cho tam giác abc vuông tại a (AB>AC). Tia phan giac cua goc B cat AC ở D. Kẻ DH vuong goc voi BC. Tren tia AC lay diem E sao cho AE=AB. duong thang vuong goc voi voi AE tai E cat DH o K
a) CMR BA=BH
b) tinh goc DBA
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