Cho tu giac MNEF,goc M=100°,goc N=120°,E-F=20°.Tinh goc E va F
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cho tu giac abcd biet goc a: goc b: goc c: goc d =4:3:2:1
a) tinh cac goc cua tu giac abcd
b) cac tia phan giac cua goc c va goc d cat nhau tai e. cac duong phan giac cua goc ngoai tai ca dinh c va d cat nhau tai f. tinh goc ced va goc cfd
a) Ta có: \(\frac{\widehat{A}}{4}=\frac{\widehat{B}}{3}=\frac{\widehat{C}}{2}=\frac{\widehat{D}}{1}\)
Áp dụng t/c dãy tỉ số bằng nhau ta được:
\(\frac{\widehat{A}}{4}=\frac{\widehat{B}}{3}=\frac{\widehat{C}}{2}=\frac{\widehat{D}}{1}=\frac{\widehat{A}+\widehat{B}+\widehat{C}+\widehat{D}}{4+3+2+1}=\frac{360}{10}=36\)
\(\Rightarrow\widehat{A}=144^0;\widehat{B}=108^0;\widehat{C}=72^0;\widehat{D}=36^0\)
Cho tu giac ABCD co O la giao diem cac tia phan giac cua cac goac C va D
a Ting COD biet goc A bang 120 ggoc B bang 90
b Tinh Cod theo A va B
cCac tia phan gia cua cac goc A va B cat nhau tai I va cat cac tia phan giac cac goc C va D thu tu tai E va F. C/m rang tu giac OEIF co cac goc doi bu nhau
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cho tam giac vuong tai A va AB =6cm AC = 8cm , AH la duong cao
a, tinh BCva AH
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c, Goi M ,N lan luot la trung diem cua BH va CH . tu giac MNFE la hinh gi ? Vi sao ?
d, Tinh dien tich tu giac MNFE
Cho tu giac ABCD co goc A = 1000, B = 1200 , cac tia phan giac cua goc C va D cat nhau tai E.
a) Tinh CED
b) Cac tia phan giac cua goc ngoai tai dinh C va D cat nhau tai F. Chung minh: \(\widehat{CED}+\widehat{CFD}=180^0\)
Cho tu giac ABCD co A = 1000 , B = 1200 , cac tia phan giac cua C va D cat nhau tai E
a) Tinh goc CED
b) Cac tia phan giac cua goc ngoai tai dinh C va D cat nhau tai F. Chung minh: CED + CFD = 1800
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
cho tu giac ABCD co goc A =a ,C=b . hai duong thang AD va BC cat nhau tai E ,hai duong thang ABva DC cat nhau tai F . Cac tia phan giac cua hai goc AEB va AFDcat nhau tai I .tINH goc EIF theo a,b
Cho tu giac ABCD biet so do cua cac goc A ,B,C,D ti le thuan voi5,8,13,10 .a, Tinh so do cac goc cua tu giac ABCD . b, Keo dai hai canh AB va DC cat nhau o E , keo dai hai canh AD va BC cat nhau o F . Hai tia phan giac cua cac goc AED va goc AFB cat nhau o O . phan giac cua goc AFB cat cac canh CD va AB tai M va N . Chung minh O la trung diem cua doan MN
CAC BAN GIUP MINH VOI MINH CAN GAP
cho tam giac abc can tai c va goc c = 100 do bd la phan giac cua goc b tu a ke ax tao voi ab mot goc 30 do tia ax cat bd tai m cat bc tai e bk la phan giac abd bk cat ax tai n tinh acm so sanh mn va ce