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cho tam giac[ABC vuong tai A, co goc B 60 do. ve AH vuong goc voi BC tai H. tren canh AC lay diemE sao cho AD AH. goiI la trung diem cua canh HD. tia AI cat canh HC tai diem K a) tinh ;so do goc HAB b) chung minh tam giac AHI tam giac DHI. tu do ;suy ra AI vuong goc HD c)chung minh AB // KD d)tren tia doi cua tia HA lay diem E sao cho HE AH. chung minh H la trung diem cua canh BC va ba diem D, K, E thang hang giup voi nha moi nguoi. minh can gap
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cho tam giac[ABC vuong tai A, co goc B = 60 do. ve AH vuong goc voi BC tai H. tren canh AC lay diemE sao cho AD= AH. goiI la trung diem cua canh HD. tia AI cat canh HC tai diem K
a) tinh ;so do goc HAB
b) chung minh tam giac AHI = tam giac DHI. tu do ;suy ra AI vuong goc HD
c)chung minh AB // KD
d)tren tia doi cua tia HA lay diem E sao cho HE = AH. chung minh H la trung diem cua canh BC va ba diem D, K, E thang hang
giup voi nha moi nguoi. minh can gap
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
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 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
19 tháng 4 2022 lúc 22:22
cho tam giac ABC v uong tai A (AB < AC ) , ke AH vuong goc voi BC tai H . tren canh AC lay diem I sao cho AH =AI . qua I ke duong thang vuong goc voi A C , cat BC tai D
a, CMR : tam giac AHD = tam giac AID va` AD la tia phan giac cua ∠HAC
b, tia ID cat tia AH tai M . CMR △MCD can
c, go.i N la` trung diem cua MC . CMR AN,MI,BC do^`ng quy
Cho tam giac ABC vuong tai A co AB=9cm, BC= 15cm
a, Tinh do dai canh AC va so sanh cac goc cua tam giac ABC
b, Tren tia doi cua tia AB lay diem D sao cho A la trung diem cua doan thang BD . Chung minh tam giac BCD can
c, E la trung diem canh CD, BE cat AC o I. CHung minh DI di qua trung diem 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...
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.
1/Cho tam giac ABC co goc A=120 do.Cac tia phan giac BE, CF cua ABC va ACB cat nhau tai I (E,F lan luot thuoc cac canh AC,AB).Tren canh BC lay 2 diem M,N sao cho BIM=CIN=30 do.
a)Tinh so do cua goc MIN
b)Chung minh CE+BF<BC
2/Cho tam giac DEF vuong tai D va DF>DE, ke DH vuong goc voi EF (H thuoc EF). Goi M la trung diem cua EF.
a)Chung minh goc MDH=goc E-goc F
b)Chung minh EF-DE>DF-DH
cho tam giac ABC can tai A . M la mot diem thay doi tren BC . c/m rang khi M la mot diem bat ki tren BC thi tong khoang canh tu M den 2 canh AB va AC la ko doi
cho tam giac nhon ABC ve ra phia ngoai tam giac vuong can ABD va AEC(vuong can tai B va tai C ). tren tia doi cua tia AH lay diem I sao cho AI=BC(AH vuong goc voiBC(H thuoc BC)cm
a)tam giac ABI=tam giac BDC
b)Bivuong goc voi CD