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!
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
cho ba diem a b c thang hang va d khong thuoc duong thang do . hoi co the ve duoc tat ca bao nhieu duong thang di qua hai trong bon diem noi tren ?
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?
5. Dien de duoc phat bieu dung
a)Mot phan duong thang bi chia ra boi diem O cung voi diem O duoc goi la mot ...
b)Hinh tao boi diem O va mot phan duong thang chua tat ca cac diem nam cung phia la mot ...
c)Neu diem O nam tren duong thang xy thi diem O la goc chung cua
d)Hinh gom hai diem ... va tat ca cac diem nam giua ... duoc goi la doan thang RS. Hai diem ... duoc goi la hai mut cua doan thang RS.
e)Khi MP+MK=PK thi .........
f)Diem M la trung diem AB neu M ...... A, B va ..... cach deu ........
tren duong thang xy lay diem O, ve them hai tia Om va On . co tat ca bao nhieu goc? la nhung goc nao? trong do co goc bet khong?
giup minh voi! ai giup duoc cho 10 tk lien!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
Cho 100 diem trong do co dung 4 diem thang hang , ngoai ra khong co 3 diem nao thang hang . Cu 2 diem ta ve duoc mot duong thang . Hoi co tat ca bao nhieu duong thang
QUA HAI DIEM VE DUOC MOT DUONG THANG . MOT HOC SINH SAU KHI VE VA DEM DUOC 69 DUONG THANG , TRONG DO CHI CO MOT DUONG THANG DI QUA 5 DIEM , NGOAI RA KHONG CO BA DIEM NAO THANG HANG . HOI CO TAT CA BAO NHIEU DIEM DA CHO ?