Các câu hỏi tương tự
cho tam giac abc vuong tai a co ac=3ab . tren tia ac lay d va e sao cho ad=de=ec. tinh so do goc bca va goc bea
cho tam giac can ABC (AB=AC) co goc A khong phai goc vuong . Tu A ke mot tia vuong goc voi AB cat duong thang BC o D. TInh hieu giua cac so do cua hai goc C va D cua tam giac ACD
cho tam giac ABC co AB< AC co 3 goc nhon . Ke AH vuong goc BC tai H . Ve ra phia ngoai tam giac ABC cac doan thang BD vuong goc AB , BD = AB ; CE vuong goc AC , CE= AC . Ke DM vuong goc BC tai M ; EN vuong goc BC tai N
a, so sanh :goc DBM va goc BAH ; goc ECN va goc CAH
b, chung minh DM = BH , EN = CH
cho tam giac ABC co : AB= 9cm, AC= 12cm, BC= 15cm
1) tam giac ABC co dang dac biet nao? Vi sao ?
2) ve trung tuyen AM cua tam giac ABC, ke MH vuong goc voi AC
Tren tia doi tia MH lay diem K sao cho MK= MH
a) CM tam giac MHC= tam giac MKB. tu do suy ra BK//AC
b)BH x AM tai G. CM: G la trong tam cua tam giac ABC
tam giac ABC co AH vuong goc BC, BK vuong goc AC ( AH ko nho hon BC , BK ko nho hon AC) Tinh so do goc tam giac ABC
cac tam giac ABC va DEF co goc A=goc D, AC=DF. Hay bo sung them mot dieu kien bang nhau (ve canh hay goc ) de tam giac ABC= tam giac DEF
Cho tam giac ABC co goc B>goc C duong thang chua tia phan giac goc ngoai dinh A cat duong thang BC o E.CM goc AEB=1/2.(goc B-goc C)
Cac ban co gang giup do. Neu co ai muon thay hinh anh cua minh thi len facbook nhan Le Dinh LUC
BAI 1
a,CHO TAM GIAC ABC CO CANH AB= 4CM ; AC =5 CM BC =6CM SO SANH CAC GOC ABC
b, CHO TAM GIAC ABC CO GOC A = 80 DO GOC B =65 DO HOI CANH NAO NHO NHAT
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