cho tam giac ABC co goc A vuong canh AB = 40m canh AC = 30m canh BC = 50m tren canh AC lay diem F tren canh AB lay diem E sao cho hinh thang EFCB co chieu cao la 12m tinh dien tich cua tam giac AEF va dien tich hinh thang EFCB ?
cho hinh tam giac abc co dien tich 429 cm.diem n lachinh giua canh ac ,tren ab lay diem p sao cho ab = 3 pb, duong thang pn va cp cat nhau ctai diem k . tinh dien tich bkc
cho tam giac ABC , D la diem chinh giua cua canh BC , E la diem chinh giua cua canh AC . DA va BE cat nhau tai I hay so sanh dien tich cua 2 tam giac IAE va IBD?
cho hinh thang ABCD co day nho bang 2/3 day lon noi Avoi C ,tren AC lay MN sao cho AM=MN=NC,biet dien tich tam giac ADM =9,3 cm2 .Tinh a) dien tich tam giac ADC ,b) tim ti so % giua dien tich tam giac ADM va dien tich tam giac ABN
cho tam giac abc vuong tai a do dai ab = 30cm , ac=40cm tren ab lay diem e sao cho e = 1/3 ab . D la trung diem cua dc noi a voi d ,c voi e cat nhau tai m . tinh dien tich ema
cho hinh chu nhat ABCD co CD la 76 cm; AD la 38 cm; AN la 14 cm.
a) tinh dien tich hinh chu nhat ABCD
b) tinh dien tich hinh thang NBCD
c) tren BC lay trung diem M, noi D voi M. Tinh dien tich hinh tam giac MDC
Cho tam giac ABC co BC=5cm . Diem D thuoc canh BC sao cho DC=2cm . Cho biet goc ADB=70o
a)Tinh do dai BD?
b)Tren nua mat phang chua A co bo BC , ve tia Dx sao cho goc CDx =50o.Tinh goc ADx?
c)Goi M la giao diem cua tia Dx va canh AC ,tim cac tam giac trong hinh ve
cho hinh tam tam giac ABC co canh AB= 30cm, BC = 25cm chu vi hinh tam giac la 8dm. tinh do dai canh CA
Bai 1: Cho doan thang AB=8cm . Tren tia AB lay diem M sao cho AM=4cm a) Diem Mco nam giua hai diem A va B khong ? Vi sao? b) So sanh AM va MB c) M co la trung diem cua doan thang AB khong?
Cac giai ho minh . Nho ve hinh nha !
Thank you very much