cho 4 diem A;B;C;D khong nam tren duong thang a. biet doan thang AB khong cat a doan thang BC cat a.doan thang CD khong cat a. hoi doan thang AD co cat a hay khong
4 DIEM A B CS KHONG NAM TREN DUONG THANG a chung to rang duong thang a hoac cat ,hoac khong cat hoac cat 3 hoac cat 4 doan thang trong cac doan thang ab ac ad bc bd cd ? giup minh voi cac ban
bon diem A;B;C;D ko nam tren duong thang a.chung to rang duong thang a ko cat hoc cat 3 hoac cat 4 cac doan thang AB;AC;AD;BC;BD;CD
cho 3 diem A;B;C khong thouc duong thang a.Biet rang duong thang a khong cat cac doan thang AB;AC.Hoi duong thang a co cat doan BC KO .vI SAO
Cho doan thang d . Ve them 4 diem M,N ,P,Q theo thu tu ay . Ve diem A khong nam tren duong thang d.
a) Ve tia AM, tia QA
b)Ve duong thang AN va duong thang AP.
c) hinh tren co bao nhieu doan thang?
Cho 10 diem trong do co 4 diem thang hang , ngoai ra khong co 3 diem nao thang hang nua qua 2 diem ta veduoc 1 doan thang,1 duong thang . Hoi co bao nhieu doan thang, duong thang
Cho 4 diem A,B,C,D theo thu tu do tren mot duong thang va AB=CD=3; BC=5. Hay chung to rang:
a, AC=BD
b, Hai doan thang BC va AD co cung mot trung diem.(ve hinh ra nhe)
Cho ba diem A,B,C khong thang hang ve duong thang a cat cac doan thang AB,AC va khong di qua A,B,C
a) goi ten hai nua mat phang doi nhau bo a
b) doan thang BC co cat duong thang a khong
cho 3 diem A, B ,C thang hang va D khong nam tren duong thang AB. co the ve duoc bao nhieu duong thang di qua 2 trong 4 diem tren