Các câu hỏi tương tự
cho tam giac ABC co gocBAC >90 do. Goi I la trung diem cua AC. Tren tia doi cua IB lay D sao cho IB=ID.
a, Chung minh tam giac AIB bang tam giac CID
b,Chung minh goc AIB nho hon goc BIC
c, Tim dieu kien cua tam giac ABC de AB vuong goc voi CD
cho tam giac ABC co AB be hon AC, AD laf tia phan giac cua goc BAC(D thuoc BC). Tren canh AC lay diem E sao cho AE=AB.C/m rang tam giac ABD=tam giac AED, CD lon hon DB
cho tam giac abc co goc a nho hon 90 do cho tam giac abc co 2 doan thang ad vuong goc va bang ab,ae vuong goc va bang ac
a, cmr dc=be va dc vuong goc voi be
b, goi n la trung diem cua de.tren tia doi cua tia na lay m sao cho na=mn . chung minh ab=me va tam giac abc=tam giac ema
Cho tam giac ABC vuong tai A (AB lon hon AC) .Goi M la trung diem cua BC . Tren tia doi tia MA lay D sao cho MD=MA .
a, Cho AB = 8 cm ; BC = 10 cm . Tinh AC ?
b, C/m . tam giac AMB = tam giac DMC , tu do suy ra CD vuong goc voi AC
c, Ve AH vuong goc voi BC tai H , tren tia doi cua HA lay E sao cho HE=HA . C/M tam giac ACE can
d, c/m . BD=CE.
Cho tam giac ABC vuong o A; D la trung diem cua BC. Tren tia doi cua tia DA lay E sao cho DA=DE
a> Chung minh: tam giac ABD= tam giac ECD
b>Chung minh: AB//CE
c> Goi M la trung diem cua AC. DM//CE va 2DM=CE
d> Ve MD vuong goc voi BE. CMR: tam giac NDE= tam giac MDC
cho tam giac ABC co goc a nhon M la trung diem cua BC tren tia doi cua tia MA lay diem D sao cho MA=MD chung minh BAM=CDM chung minh AC=AD tren nua mat phang Bo AB ko chua C ve tia Ax vuong goc AB tren nua mat phang bo AC ko chua B ve tia Ay vuong goc AC tren tia Ax lay Diem P sao cho AP=AB tren tia Ay lay diem Q sao cho AQ=AC chung minh tam giac ABQ= tam giac APC goi giao diem cua DA va PQ la K chung minh AK vuong goc PQ
cho tam giac ABC. Goi M la trung diem BC va AM la tia phan giac cua goc A. Ve MI vuong goc AB, MH vuong goc AC. Chung minh rang:
a, MI = MH
b, Tam giac ABC can
c, Cho AB = 17 cm, AM = 15 cm. Tinh BC
d, Tren tia doi cua tia BC lay diem D, tren tia doi cua tia CB lay diem E sao cho BD = CE. Chung minh: tam giac AED can
cho tam giac abc co ab be hon ac goi m la giao diem cua bc tren tia doi cua tia ma lay diem d sao cho ma = md so sanh goc bam va goc cam
cho tam giac ABC co goc B lon hon goc C
a,so sanh do dai 2 canh AB va AC
b, goi M la trung diem cua BC . Tren tia doi cua MA lay diem D sao cho MD=MA . Chung minh CD = AB va \(\widehat{CDA}>\widehat{CAD}\)