CHO DO DAI CAC CANH TAM GIAC ABC LA ;B;CVA DUONG CAO TUONG UNG LA HA;HB;HC BIET CHU VI TAM GIAC LA 94CM VA CAC DUONG CAO THEO THU TU TREN TI LE VOI 3;4;5 TIM A;B;C
goi a,b,c la cac canh cua 1 tam giac co 3 duong cao tuong ung la ha,hb,hc. cmr (a+b+c)^2/ha^2+hb^2+hc^2 lon hon hoac bang 4
cho mot tam giac co chhu vi =60cm.cac duong cao co do dai la 12cm;15cm;20cm.vay cac canh tuong ung co do dai la
Neu 1 tam giac co do dai 2 duong cao lan luot la 32;52 va duong cao thu 3 cung la so ching phuong thi do dai duong cao thu 3 la bao nhieu?
goi ha,hb,hc la 3 duong cao cua mot tam giac.c/m (1/ha)<(1/hb+1/hc)
Cho 1 tam giac co do dai 2 duong cao lan luot la 32va52.Biet do da duong cao thu 3 cung la co chinh phuong thi do dai duong cao thu 3 la bao nhieu?
Ba duong cao cau tam giac ABC co do dai la : 4;12;a.Biết rang a la so tu nhien. Tìm a
cho tam giac ABC vuong tai A voi duong cao AH . Goi AD la phan giac cua tam giac HAC ha tu dinh A. Biet AC=8 cm, BC = 17 cm. do dai BD la
c/m rang tong cua ba duong trung tuyen cua mot tam giac lon hon 3/4 chi vi nhung nho hon chu vi cua tam giac do
c/m rang trong tam giac vuong, trung tuyen ung voi canh huyen bang nua canh huyen
c/m rang: neu mot tam giac co trung tuyen thuoc mot canh bang nua canh ay thi tam giac do la tam giac vuong