Cho tam giac ABC . Keo dai canh BC ve phia B mot doan BB' bang CB, keo dai canh BA ve phia A mot doan AA' bang BA , keo dai canh AC ve phia C mot doan CC' bang AC . Noi A / B ; B / C ; C / A.Dien tich tam giac A/B/C so voi dien tich tam giac ABC thi gap.
A.6 lan B.7 lan C.8 lan D.9 lan
cho 1 tam giac abc co dien tich bang 250 cm2 keo dai canh bc ve phia c them 1 doan
cho tam giac abc co dien tich la 336m2 va co day bc la 28m nay nguoi ta mo rong them bang cach keo dai day bc ve phia c mot doan cd nen dien tich tang them 84m2 tinh doan cd?
cho tam giac abc co dien tich 150cm2 neu keo dai ab ve phia b 1 doan 7cm thi dien tich hinh tam giac tang them 2cm tinh canh day ab
cho hinh tam giac ABC. Keo dai ve phia B mot doan BM dai 12cm .Biet dien tich hing tam giac ABM la 120 xang ti met vuong, CB dai 18cm . Tinh dien tich tam giac ABC
Cho hinh tam giac ABC co day BC dai 2cm.Nguoi ta keo dai day BC ve phia C them mot doan CD thi dien tich tam giac ABD= 3/2 dien tich tam giac ABC. Tinh do dai CD
Cho hinh thang ABCD co day AB bang 8 cm,day CD gap 3 lan day AB va dien tich hinh thang ABCD la 320cm2.Keo dai canh DA ve phia A,cat canh CD tai phia N.
a.Tinh dien tich hinh tam giac ABC;BDA
b.Tinh do dai doan thang AN
cho tam giac abc co dien tich bang 72 cm vuong canh day bc bang 6cm neu keo dai canh day ve phia c mot doan 3cm thi dien tich cua hinh tam giac sau khi mo rong la bao nhieu ?
giup mk nhe
cho 1 tam giac abc co dien tich 150cm2 neu keo dai ab ve phiab 1 doan bn bang 7cmthi dien tich tam giac tang them 21cm2 tinh canh day ab