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cho tam giac ABC can tai A va goc A bang 30 do .Tren nua mat phang bo AB co chua diem C ve tia Bx vuong goc BA. Tren tia Bx lay diem N sao cho BN=BA .Tinh goc BCN
Cho tam giac ABC cam tai A. Goc A = 30 do. Tren nua mat phang bo AB co chua diem C ve tia Bx vuong goc voi ti BA. Tren tia Bx lay diem N sao cho BA = BN. Tinh goc CNB ?
1 cho tam giac abc can a , goc a bang 40 do lay d khac phia b so voi ac thoa man goc cad bang 60 do goc cad bang 80 do chung minh bd vuong goc voi ac2 cho tam giac abc vuong can a . d la diem bat ki tren ab. tren nua mat phang bo ab tu c ve tia bx sao cho goc abx bang 135 do. duong thang vuong goc voi dc ve tu d cat bx o e . chung minh tam giac dec vuong can3 cho tam giac abc can b goc abc bang 80 do , i la diem trong tam giac sao cho goc iac bang 10 do, ica bang 30 do tinh goc abi4 cho tam gia...
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1 cho tam giac abc can a , goc a bang 40 do lay d khac phia b so voi ac thoa man goc cad bang 60 do goc cad bang 80 do chung minh bd vuong goc voi ac
2 cho tam giac abc vuong can a . d la diem bat ki tren ab. tren nua mat phang bo ab tu c ve tia bx sao cho goc abx bang 135 do. duong thang vuong goc voi dc ve tu d cat bx o e . chung minh tam giac dec vuong can
3 cho tam giac abc can b goc abc bang 80 do , i la diem trong tam giac sao cho goc iac bang 10 do, ica bang 30 do tinh goc abi
4 cho tam giac abc can a co goc a bang 100 do , bc =a, ac =b ve phia ngoai tam giac abc ve tam giac abd can d co goc adb bang 140 do tinh ch vi tam giac adb theo a,b
ve hinh gium minh voi , xin mn day
cho tam giac ABC can tai A,goc A=30 do.Tren nua mp bo ab co chua c ve tia Bx vuong goc voi BA.Tren tia Bx lay diem N sao cho BN=BA.Tinh goc BCN
Cho tam giac ABC vuong can tai A, D la mot diem bat ki tren canh AB. Tren nua mp bo AB co chua diem C, ve tia?
mat phang bo AB co chua diem C, ve tia Bx de goc ABx=135 do. Duong thang vuong goc vs Dc ve tu D cat tia Bx tai E. Chung minh tam giac DEC can
giups mk
cho tam giac ABC nhon tren nua mat phnag co chua A bo BC ve tia Bx vuong goc voi BC tren tia do lay D sao cho BD=BC tren nua mat phang co hcua diem C bo AB ve tia By vuong goc voi AB tren tia do lay diem E sao cho BE=BA goi giao diem cua DA voi BC va EC theo thu tu la H,K tinh goc BKA
Cho tam giac ABC co goc A < 90o ; AB = AC; AM la tia phan giac cua goc A (M thuoc BC)
a. CM goc B bang goc C
b. Tren cung mot nua mat phang bo AB khong chua diem C ke tia Ax vuong goc voi AB, tren nua mat phang bo AC khong chua diem B ke tia Ay vuong goc voi AC. Tren tai Ax va Ay lan luot lay 2 diem N va P sao cho AN=AP. CM rang BP=CN
c.CM NP song song voi BC
Cho tam giac ABC can tai A.Tren canh AB lay diem D sao cho AD=BC.Qua D ve 1 duong thang song song voi BC,tren do lay DE=AB(E thuoc nua mat phang chua C,bo la duong thang AB). a) chung minh tam giac EDA=tam giac ABC; b) tinh so do goc DAE?;c) chung minh tam giac ACE deu
a)C/M neu tam giac vuong co mot canh goc vuong bang nua canh huyen thi goc doi dien voi canh ay bang 30'
b)Cho tam giac ABC, goi M la trung diem cua BC, ve AH vuong goc voi BC (H thuoc canh BC). Biet rang BAH=HAM=MAC. Tinh cac goc cua tam giac ABC.