Các câu hỏi tương tự
cho tam giac abc can tai A D la diem tuy y trong tam giac sao cho goc ADB <goc ADC cmr DC>DB
cho tam giac abc co goc b = goc c, tia phan giac cua goc a cat bc tai d
1. chung minh tam giac adb = tam giac adc
2. chung minh ad vuong goc voi bc
3. tren tia doi cua tia da lay diem m sao cho da = dm, chung minh ab // cm
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...
Đọc tiếp
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
giai bai tap; cho tam giac abc la tam giac nhon. tia phan giac cua goc bac cat bc tai d. tren canh ac lay diem e sao cho ae=ab. chung minh: a. db=de b.ad la duong trung truc cua be c. goc c bang 40 do, goc edc bang 30 do. tinh goc a va goc b cua tam giac abc
cho tam giac abc la tam giac nhon. tia phan giac cua goc bac cat bc tai d. tren canh ac lay diem e sao cho ae=ab. chung minh: a. db=de b.ad la duong trung truc cua be c. goc c bang 40 do, goc edc bang 30 do. tinh goc a va goc b cua tam giac abc
cho tam giac ABC can tai A( goc A < 900) ve BD vuong goc voi AC, CE vuong goc voi AB. goi H la giao diem cua BD va CE.
a) CM: tam giac ABC= tam giac ACE
b) CM : tam giac AED can
c) CM: AH la duong trung truc cua ED
d) tren tia doi DB lay diem K sao cho DK= DB. CM: tam giac ECB= tam giacDKC
cho tam giac abc vuong tai a co goc b bang 60 do tren canh bc lay diem h sao cho hb=ab duong vuong goc voi bc tai h cat ac tai d
a/ cm bd la tia phan giac cua goc adc
b/ chung to tam giac bdc can
CHo tam giac ABC can tai A;goc BAC =108 do.O la mot diem nam tren tia phan giac goc Csao cho goc CBO=12 do.VE tam giac deu BOM.C/m C;A;'M thang hang
cho tam giac ABC can tai A co goc A=100. Goi O la diem nam tren tia phan giac cua goc C sao cho goc CBO=30. tinh goc CAO