Các câu hỏi tương tự
1. Tren 1 duong thang xy lay 4 diem phan biet A,B,C,D hay chi ra cac tia doi nhau
2. cho 10 diem trong do khong co ba diem thang hang . Cu qua hai diem ta ve duoc 1 duong thang . Hoi co tat ca bao nhieu duong thang?
3. cho n diem trong do khong co ba diem nao thang hang . Cu qua hai diem trong so cac diem do ve duoc 1 duong thang. Biet rang co 435 duong thang tao thanh .Tim n?
Cho 50 diem phan biet, trong do co 5 diem thang hang. Qua 2 diem bt ky ta ke duoc 1 duong thang. Hoi co tat ca bao nhieu doan thang nhan 2 trong 50 diem do lam dau mut.
cho hai duong thang a va b song song. tren duong thang a lay 10 diem phan biet, tren duong thang b lay 15 diem phan biet. hoi co the ve bao nhieu duong thang phan biet qua 2 trong cac diem da cho ?
Tren duong thang x,y lay o.Lay diem a thuoc tia ox,B thuoc tia oy sao cho OA=2cm;OB=2oa
A)Tinh do dai doan AB?
B)Goi Yla trung diem cua OB.Chung minh O la trung diem cua doan thang AI
C) Tren duong thang xy lay 100 diem diem phan biet(khac O,A,B,I).Noi 2 diem ta duoc mot doan thang.Hoi co bao nhieu duong thang tao thanh?
giup minh voi! HELP ME!!!!!
1. Lay 4 diem A, B, C, D trong do khong co 3 diem nao thang hang. Ke cac duong thang di qua cac cap diem. Co bao nhieu duong thang tat ca? do la nhung duong thang nao?
2. Lay 4diem M,N,P,Q trong do 3 diem M,N,P thang hang va diem Q nam ngoai duong thang do. ke caacacc duong thang di qua cac cap diem. co bao nhieu duong thang phan biet? viet ten cac duong thang do
mong cac ban giai ho minh!
cho diem O nam ngoai duong thang d. tren dung thang d lay ba diem A,B,C saocho AB=6cm;AC=2cm
a tinh BC
b gia su goc OAB=180 do;tinh goc OAC
c tren dung thang d lay them 2015 diem phan biet [khac A,B,C] hoi co bao nhieu goc co dinh O va canh di qua 2 diem thuoc dung thang d
tren duong thang xy lay them 2012 diem M1, M2,M3,..,M2012 phan biet voi nhau va phan biet voi cac diem A, B,O,I co the ve duoc bao nhieu goc dinh C ma cac canh la cac tia goc C va di qua cac diem da cho tren duong thang xy
tren duong thang xy lay 10 diem phan biet. hoi co bao nhieu tia phan biet, co bao nhieu cap tia phan biet
cho tam giac ABC co BC=4cm. tren tia doi cua tia BC lay diem D sao cho BD=2cm/ a, tinh do dai CD; b,goi M la chung diem cua CD.tinh do dai BM;c,biet goc DAC bang 112 do .Ãxtia phan giac cua goc BAC va goc BAD. tinh so do goc xAy;d, tren nua mat phang bo la duong thang AC co chua diem D neu ve them n tia goc A phan biet khong trung voi cac tia ÂC,Ã,AB,Ay,AD thi co tat ca bao nhieu goc dinh A va Ay thu tu la
cho 2013 diem phan biet . trong do 13 diem thang hang . cu qua 2 diem ta ve 1 doan thang . hoi tat ca co bao nhieu doan thang