Cho tam giac ABC. Tren canh AB lay M trung diem; tren canh AC lay N sao cho AN bang 1/2 NC. Tinh dien tich tam giac AMN, biet diwn tich tam giac ABC 340,2cm2
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bai 3 ; cho tam giac abc . tren canh ab lay diem m , tren canh ac lay diem n sao cho bm = cn . goi i la trung giem doan bn , goi k la trung diem doan cm , duong thang ik cat ab tai p , cat ac tai q . chung minh rang tam giac apq la tam giac can .
cho tam giac ABC lay diem M tren canh AB sao cho AM=1/3 AB lay diem N tren canh AC sao cho AN = 2/3 AC tren canh BC lay diem P sao cho CP=1/3 BC tinh dien tich tu giac BMNP biet dien tich tam giac ABC la 108 cm2
cho tam giac abc tren canh ab lay diem m,tren canh ac lay diem n so cho am bang 1/3 ab,nc=2/3 ac.hoi dien tich tam giac abc gap may lan tam giac amn
cho hinh tam giac ABC .Tren canh AB lay diem M tren canh AC lay diem N sao cho AM=1/3 AB NC=2/3 AC.Dien tich hinh tam giac ABC gapdien tich hinh tam giac AMN so lan la
cho tam giac ABC co AB = AC Goi M la trung diem cua canh BC tren canh BA lay diem E tren canh CA lay diem F sao cho BE =CF chugn minh EF song song voi BC
cho tam giac ABC. tren canh ab lay diem m ,tren canh ac lay diem n sao cho am = 1/3ab, nc =2/3 ac.dien tich tam giac abc gap dien tich tam giac amn bao nhieu lan
cho tam giac ABC. Tren canh AB lay diem I sao cho AB = 2AI, tren canh AC lay diem J sao cho AC= 3CJ. dien tich tam giac ABC gap may lan dien tich tam giac BIJ
cho tam giac ABC. Tren canh AB lay diem I sao cho AB = 2AI, tren canh AC lay diem J sao cho AC= 3CJ. dien tich tam giac ABC gap may lan dien tich tam giac BIJ
vi vay nen dien tich ABC gap 3 lan tam giac BJI
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Tam giac ABC can tai A tren canh AB lay diem E tren canh AC lay diem F sao cho BF=CE .goi O la giao diem cua ba duong trung truc cua tam giac .ABC.Chung minh O thuoc duong trung truc cua EF