Các câu hỏi tương tự
tren mat phang cho 40 diem trong do co 30 diem thang hang hoi ve duoc tat ca bao nhieu tam giac tu 40 diem da cho?????????????
cho 21 dien khong co 3 diem nao thang hang ve duoc bao nhieu tam giac co 3 dinh la 3 tong cac diem da cho
trong mat phang cho 10 diem phan biet, trong do khong co 3 diem nao thang hang.Hoi co the ve duoc bao nhieu tia, bao nhieu doan thang, bao nhieu duong thang? (neu trong diem phan biet do co 5 diem thang hang thi ve duoc bao nhieu tia, bao mhieu doan thang, bao nhieu duong thang).
cho 50 diem trong do co dung m diem thang hang , ngoai ra ko co 3 diem naop thang hang. cu qua 2 diem ta ve duoc 1 duong thang .so duong thang ve duoc la 1215 duong thang.tim m
tren nua mat phang cho n diem phan biet, trong do co dung 3 diem thang hang. Qua 2 diem ta ve mot doan thang. biet so doan thang la 171. Tim n
cho diem M nam tren doan thang AB . Ve ve mot phia cua AB tam giac deu AMC va DMB
a)Chung minh rang : AD=CB
b)Goi I,K theo thu tu la trung diem cua AD , CB.Tam giac MIK la tam giac j ?
ko can ke hinh dau cac pn ak !!! ^ - ^
Bai 1: Cho 60 diem trong do co 15 diem thi cu qua 2 diem ve duoc 1 duong thang . Hoi ve duoc bao nhieu duong thang ? Bai 2:Cho n diem ko co 3 diem nao thang hang cu qua 2 diem ve duoc 1 duong thang . Biet ve duoc 28 duong thang . Tinh so diem n ?
cho n diem trong do ko co 3 diem nao thang hang. Cu qua 2 diem ve 1 duong thang so duong thang ve duoc la153
Cho tam giac ABC co BC = 5cm. Diem D thuoc canh BC sao cho DC = 2cm, goc ADB = 70 do.
a) Tinh BD?
b) Tren nua mat phang bo BC chua diem A. Ve tia Dx sao cho goc CDx = 50 do. Tinh goc ADx?
c) Goi M la giao diem cua Dx va AC. Tim cac tam giac trong hinh ve