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9 tháng 5 2022 lúc 21:28
cho tam giac abc vuong tai a,co ab=3cm,ac=4cm.
a)tinh bc va so sanhcac goc cua tam giac abc
b)ke ah vuong goc voi bc,lay d tren bc sao cho h la trung diem cua bd.cm:tam giac abd can tai a
c)tren ah lay m sao cho h la trung diem cua am.cm:tam giac abm la tam giac can
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 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 vuong tai co AB =5 BC=10
a) tinh do dai AC b)ve duong phan giac BD cua tam giac ABC va goi E la hinh chieu cua D tren BC cmr tam gia ABD =tam gic EBD
c)
cho tam giac ABC vuong tai a, co B=60 va AB=5cm .tia phan giac cua goc B cat AC tai D .Ke de vuong goc voi AC tai E
1/ chứng minh tam giác ABD= tam giác EBD
2/chung minh tam giac ABE la tam giac deu
3/tinh do dai canh BC
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...
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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 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 vuong tai A co AB=5cm,BC=10cm
a, Tinh do dai AC
b, ve duong pg BD cua tam giac ABD va goi E la hinh chieu cua D tren BC. Chung minh tam giac ABC=EBD va AE vuong goc voi BD
c, goi giao diem cua 2 duong thang ED va BA la F. chung minh tam giac ABC=AFC
d, Qua A ve duong thang // voi BC cat CF tai G. chung minh 3 diem B,D,G thang hang
cho tam giac ABC vuong tai A co AC = 2AB . goi D la trung diem cua AC . dung AH , DK vuong goc voi BC
a ) cm ; goc ABC = goc CDK va tam giac AHB = tam giac CKD
b ) cm ; DA =DC =DH va KH = KC
c) goi I la trung diem cua BD . CM ; tam giac AHI = tam giac KHI , tu do tinh so do goc IHK
d ) duong thang qua A song song voi BC cat DK tai M . cm ; H , I , M thang hang
e ) duong thag AI cat BC tai N , cm: NK = 2NH
CHO TAM GIAC ABC VUONG TAI A CO AB=9 AC=A2
a; TINH BC
b; TIA PHAN GIAC GOC B CAT AD TAI D KE DM VUONG GOC BC TAI M CM TAM GIAC ABD=MBD
c; GOI GIAO DIEM CUA DM VA AB LA E CM TAM GIAC BEC CAN