Các câu hỏi tương tự
Cho tam giac ABC(AB khac AC) Duong trung tuuc cua doan BC tai H cat tia phan giac Ax cua Goc A tai K. Ke KE,KF theo thu tu vuong goc voi AB va Ac
a, Cm BE=CF
b, Noi EF cat BC tai M. CHUng minh M la trung diem cua BC
1)cho tam giac abc co goc b=goc c.goi i la trung diem cua canh bc.tren canh ab laydiem d,tren tia di lay diem e sao cho i la trung diem de.cm:
a,bd=ce;
b,cb la tia phan giac cua goc ace
cho tam giac ABC co goc A=90 do va AB=AC.Tren canh AB,AC lay tuong ung 2 diem D va E sao choAD=AE.Tu A va D ke duong vuong goc voi BE cat BC tai M va N.Tia ND cat CA o I.CM:
a,A la trung diem cua CI.
b,CM=MN
cho tam giac ABC (AB<AC)goi Ax la tia phan giac cua goc A,I la trung diem cua BC. Qua I ke duong thang vuong goc voi Ax cat duong thang AB tai D va duong thang AC tai E
cho tam giac ABC,AB<AC. M la trung diem cua BC,tu M ke duong vuong goc voi tia phan giac cua gocA tai N va duong nay cat tia AB tai E, cat tia AC tai F. CMR
a. AE=AF
b. BE=CF (huong dan ve BI song song voi AC, I thuoc EF)
c. AE = AB+AC:2
Cho tam giac ABC(AB>AC).M la trung diem cua BC .Duong thang di qua M vuong goc voi tai phan giac cua goc A va cat AB,AC tai Eva F .CM BE =CF
1/Cho tam giac ABC co goc A=120 do.Cac tia phan giac BE, CF cua ABC va ACB cat nhau tai I (E,F lan luot thuoc cac canh AC,AB).Tren canh BC lay 2 diem M,N sao cho BIM=CIN=30 do.
a)Tinh so do cua goc MIN
b)Chung minh CE+BF<BC
2/Cho tam giac DEF vuong tai D va DF>DE, ke DH vuong goc voi EF (H thuoc EF). Goi M la trung diem cua EF.
a)Chung minh goc MDH=goc E-goc F
b)Chung minh EF-DE>DF-DH
tam giac ABC co canh BC la canh lon nhat . Tren canh BC lay diem D va E sao choa BD=BA va CE=CA . Tia phan giac cua goc B cat AE tai M; tia phan giac cua goc C cat AD tai N. Chung ming rang tia phan giac cua goc BAC vuong goc voi MN
cho tam giac abc , ab > ac tu trung diem m cua bc ve 1 duong thang vuong goc voi phan giac cua goc a tai h cat ab ac lan luot la e va f
cm be=cf
tam giac ABC co ab>ac tu trung diem M cua BC ve mot duong thang vuong goc voitia phan giac cua gocA cat tia phan giac tai H cat AB,AC lan luot tai E va F chung minh
a) BE=CF
b) ae=ab+ac/2
be=ac-ac/2
c) goc bme=acb-b/2