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tam giac ABC co 3 duong trung tuyen AM 'BN va CP vo PN
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cho tam giac ABC co AB bang AC,I la trung diem cua BC lay M thuoc AB ,N thuoc AC sao cho AM bang AN. CMR
Tam giac ANB bang tam giac AMC ,BN bang CMGoi H la giao diem cua CM va BN. CMR tam giac MAB bang NHCAI la phan giac cua BAC, AI la duong trung truc cua BCTren tia doi cua tia CA lay diem D sao cho AB bang CD ... Ke DE vuong goc vs BC, AE song song vs ID , AE bang ID
Cho tam giac abc co ab<ac goi m la trung diem cua bc tren tia am lay diem d sao cho n la trung diem cua ad
Cm: tam giac abm= tam giac dcmCm ab//dc va so sanh goc mab va goc macTren doan thang am lay g sao cho ag=2gm tai bg cat ac tai n tia cg cat ab tai p.Cm am+bn+cp>3/4(ab+ac+bc)
cho tam giac ABC co AM la trung tuyen. tren AM lay diem d sao cho M la trung diem cua AD.Tren BC lay diem K SAO CHO C la trung diem cua BK.
CMR: a,KM trung tuyen cua tam giac ADK
b, M la trong tam cua tam giac ADK
c, so sanh cac canh cua tam giac ABC voi dg trung tuyen cua tam giac ADK.
tam giac ABC , 3 duong trung tuyen AM , BN , CE dong quy tai G .
CMR: a,AM + CE > 3/2 AC
b,biet tam giac ABC vuong tai B va BA = 5 cm , BC = 12 cm
CMR: AM + BN + CE > 26 cm
cho tam giac abc vuong tai a, duong trung tuyen cm
a) bc=10, ac=6. ab?
b) d thuoc tia doi cua mc. md=mc. cmih tg mac= tgiac mbd
c) cmih ac+bc > 2cm
d) goi k la diem tren am. ak=2/3am. n la giao diem cua ck va ad. i la giao diem cua bn va cd . cmih cd=3id
a), b), c) mih lam duoc r, cac bn gup mih y d nhe. bn nao giai duoc mih se tick cho
Cho tam giác ABC với ba đường trung tuyến AM,BN,CP.
A) CMR: AM <1/2(AB+AC)
B) CMR: 3/4(AB+AC+BC)<AM+BN+CA
cho tam giác ABC có trọng tâm G #đường trung tuyến AM : BN ; CP
CM 3(AM+BN+CP)<2(AB+BC+AC
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