Cau 13:Tam giac ABC co AB=5, AC =9 va duong trung tuyen AM =6. Tinh do dài canh B C.A A.27 B. √(17) C. √(129) D.22Lòi giǎi Chon A A596B MC Ta co: AM^2=(AC^2+AB^2)/2-(BC^2)/42 4=BC^2=4((AC^2+AB^2)/2-AM^2)=4((9^2+5^2)/2-6^2)...
Cau 18.Cho tam giac ABC vuong tai A, duong cao AH, biet BH =4cm,CH =9cm.Tinh dien tich S cua tam giac ABC C A.S=78cm^2 B.S=21cm^2 C.S=39cm^2 D.S=42cm^2 相关知识点: 试题来源: 解析 Chttp://gallery.fbcontent.cn/latex?decode=false&latex=%24%24%5Cbegin%7Baligne...