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cho tam giac ABC can co goc B =goc c =50 do goi k la diem trong tam giac sao cho goc KBC =10 do goc KCB =30 do chung minh tam giac ABK va tinh goc BAK
Cho tam giac ABC co goc B = goc C =50 do.Goi K la diem trong tam giac ABC sao cho goc KBC . CMR tam giac ABK la tam giac can va tinh goc BAK
Cho tam giac ABC co goc A =90 do . Goi E la mot diem nam trong tam giac do.CMR goc BEC la goc tu
cho tam giac ABC co goc B = 45 độ goc C bang 30 do duong cao AH M la diem tren AC sao cho AM = AH a, chung minh M la trung diem cua AC,
b, tinh so do goc AMB :
c, goi D la giao diem cua BM va phan giac goc ACB thi tam giac ABD la tam giac gi
Cho tam giac ABC co goc A =90 do ,AB=AC .Goi K la trung diem cua BC a,cmr:tam giac AKB= tam giac AKC va AK vuong goc BC b,tu C ve duong thang vuong goc voiBC cat AB tai M goi N la trung diem cua CM cmr CM//AK va KN =0.5BM
Cho tam giac ABC co goc A=60 do. Goi I la giao diem phan giac goc B va goc C. Tinh goc BIC
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 co goc a bang 90 do. bd la phan giac cua goc b ve de vuong goc bc .goi f la giao diem cua ab va de
a, chung mijh tam giac abd = tam giac ebd va duong trung truc cua ae
b, chung minh tam giac dcf can
c, khi tam giac abc co goc b bang 60 do , c = 30 do va bc = 12 cm . tinh do dai dc
cho tam giac ABC can taiA , goc A =80 do goi O la1 diem o trong tam giac sao cho goc OBC=30 do, goc OCB=10 do . cmr tam giac COA can tai A (ai giai duoc cho 1 tich)