Các câu hỏi tương tự
Cho tam giac ABC can tai A co AD la duong trung tuyen
a)Chung minh tam giac ABD= tam gaic ACD va AD vuong goc voi BC
b)Cho AB=10cm,BC=16cm. Tinh do dai AD va so sanh cac goc cua tam giac ABC.
c) Ve duong trung tuyen CF cua tam giac ABC cat AD tai M. Tinh do dai AM.
d) Ve DH vuong goc AC tai H, tren canh AC va canh DC lan luot lay hai diem E,K sao cho AE=AD va DK=DH. Chung minh: EK vuong goc voi BC
cho tam giac ABC can tai A, \(\widehat{A}\)=80do. Tren canh BC lay diem I sao cho \(\widehat{BAI}\)=50do. Tren canh AC lay diem K sao cho \(\widehat{ABK}\)=30do. 2 doan thang AI va BK cat nhau tai H. CMR: tam giac HIK can
Cho tam giac ABC can tai A,goc A=30do;BC=2.Tren canh AC lay diem D sao cho AD=√2. a)Tinh goc ABD b)So sanh 3 canh cua tam giac DBC
cho tam giac ABC co \(\widehat{A}\)=90 do, AB = 8cm, AC = 6cm
a) Tinh BC
b) Tren canh AC lay diem E sao cho AE = 2cm; tren tia doi cua tia AB lay diem D sao cho AD = AB. Chung minh: tam giac BEC = tam giac DEC
c) Chung minh: DE di qua trung diem canh BC
MINH DANG CAN GAP NHO CAC BAN GIAI SOM GIUP MINH VOI
Cho tam giac ABC co AB<AC . Tren canh AC lay diem D sao cho AD =AB . Goi M la trung diem cua canh BD
Chung minh tam giac ABM = tam giac ADM
Chung minh AM la phan giac cua goc A
Tia AM cat BC tai K . Chung minh tam giac ABK = tam giac ADK
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1. cho tam giac ABC can tai A, ve diem M, Nbat ki tren duong trung truc ca doan thang BC.CM:a,tam giac MBCcan tai Mb, MNCMNB2.cho tam giac ABC cao M la trung diem cua canh BC. qua B ke duong thang Bx AC, qua C ke Cy AB. giao diem cua Cy, Bx la D. CM: A, D, M thang hang.3. do dai 2 canh goc vuong cua mot tam giac vuong ti le voi 7 va 24. chu vi tam giac bang 112. tinh do dai canh huyen.4.cho tam giac ABC can tai A, canh day nho hon canh ben. duong trung truc cua AC cat BC tai M. tren tia doi cu...
Đọc tiếp
1. cho tam giac ABC can tai A, ve diem M, Nbat ki tren duong trung truc ca doan thang BC.CM:
a,tam giac MBCcan tai M
b, MNC=MNB
2.cho tam giac ABC cao M la trung diem cua canh BC. qua B ke duong thang Bx \\ AC, qua C ke Cy \\ AB. giao diem cua Cy, Bx la D. CM: A, D, M thang hang.
3. do dai 2 canh goc vuong cua mot tam giac vuong ti le voi 7 va 24. chu vi tam giac bang 112. tinh do dai canh huyen.
4.cho tam giac ABC can tai A, canh day nho hon canh ben. duong trung truc cua AC cat BC tai M. tren tia doi cua AM lay N \ AN = BM.
a, CM: 2 goc AMC va BAC bang nhau
b, CM: CM = CN
c, de CM vuong voi CN hi tam giac ABC phai co them dieu kien gi?
5. cho tam giac ABC deu. tren tia doi cua tia phan giac goc BAC lay D \ AD = AB. tinh cac goc cua tam giac DBC.
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
cho tam giac ABC vuong tai A co AB = 8cm, BC = 10cm a) Tinh AC, b) tren tia AC lay diem D sao cho AD = AC. Ve AE vuong goc BD tai E, ve AF vuong goc BC tai F. Chung minh tam giac ABE = tam giac ABF, c) Ve duong thang vuong goc BD tai D duong thang vuong goc BC tai C. Hai duong thang nay cat nhau ta M. Chung minh: tam giac MDC can, D) Chung minh: B,A, M thang hang
Cho tam giac ABC vuong tai B biet BC= 15cm; BA=8cm. Tren canh BC lay diem E sao cho BE=BA
a. Tinh do dai AC
b. Tam giac ABE la tam giac gi?
c. Tu B ke duong thang vuong goc voi AE tai H va AC tai D. Chung minh BD la tia phan giac cua ABC