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Ban tham khao ------ https://olm.vn/hoi-dap/detail/223399948894.html
#Py
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
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 tu giac ABCD co goc A-goc B=50 do .Cac tia phan giac cua goc C va goc D cat nhau tai I va goc CID=115 do. Tinh cac goc A va B
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
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: \(\widehat{CED}+\widehat{CFD}=180^0\)
1. Cho hinh thang ABCD , phan giac cua goc A cat duong cheo BD tai E va phan giac goc B cat AC tai F . Chung minh EF //AB?
2.Cho tam giac ABC , cac tia phan giac cua goc B va goc C cat nhau tai O . Tu A ve duong thang vuong goc voi OA cat BO , CO lan luot tai M va N . Chung minh BM vuong goc voi BN , CM vuong goc voi CN?
3.Cho goc vuong xOy ,vaf tam giac ABC vuong tai A (B thuoc Ox ,AC thuoc Oy,A va O nam tren hai nua mat phang doi nhau co bo la BC ).chung minh OA la tia phan gic cua xOy ?
cac ban giup mik nha
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
tu giac ABCD co cac goc doi bu nhau ,cac canh AD va BC keo dai ve phia A va B cat nhau tai e,cac canh ab va cd keo dai ve phia b va c cat nhau tai f.Phan giac cua goc ced cat FA,FD lan luot tai I va K .phan giac cua goc AFD cat EC,ED lan luot tai P va Q
a)chung minh tam giac FIA can ,tam giac EPQ can
b)chung minh EK vuong goc FQ
Cho tu giac ABCD co:
B + C = 2000
B + D = 1800
C + D = 1200
a) Tinh cac goc cua tia phan giac
b) Cac tia phan giac cua goc A va goc B cat nhau tai I. Chung minh: \(\widehat{AIB}=\frac{\widehat{C}+\widehat{D}}{2}\)