cac truong hop bang nhau cua tam giac
cac truong hop bang nhau cua 2 tan giac
cac truong hop bang nhau cua tam giac vuong
dinh ly by-ta-go
ai tra loi ly thuyet dunh nhanh nhat 10 tick ming co 10 tai khoan
neu them mot dieu kien de hai tam giac trong moi hinh ve duoi day bang nhau theo truong hop canh - goc- canh:
+tam giac ABC=tam giac ADC;
+tam giac AMB= tam giac EMC;
+tam giacCAB=tam giac DBA;
Cho tam giac ABC co cac goc nho hon 120 do .ve o phia ngoai tam giac ABC cac tam giac deu ABD ,ACE .goi M la giao diem cua DC va BE.cm :
a)goc BMC bang 120 do ,b)goc AMB bang 120 do
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
ve tam giac ABC biet do dai moi canh bang 3 cm . Sau do do moi goc cua tam giac.
cho doan thang bc va duog trung truc d cua no ,d giao voi bc tai m .tren d lay hai diem k va e khac m .noi eb,ec,kb,kc .chi ra cac tam giac bang nhau tren hinh ?
a/truong hop e nam giua kva m
b/truong hop m nam giua kva e
cho tam giac abc vuong tai a. tren canh ab lay d, tren canh ac lay e sao cho ad=ae, cac duong thang vuong goc ve tu a va e voi cd cat bc tai g va h. duong thang eh va duong thang ab cat nhau o m. duong thang ve tu a songsong voi bc cat hm tai i. cmr: tam giac acd bang tam giac ame
Cho goc tu AOB trong do ve cac tia OC,OD theo thu tu vuong goc voi OA,OA
a, So sanh cac goc AOD va BOC
b, Goi OM la tia phan giac cua goc COD . Xet xem OM co phai la tia phan giac cua goc AOB ko?
