cho 5 diem A B C D E sao cho 3 diem a b c thang hang ba diem b c d thang hang ba diem b c e khong thang hang a) giai thich vi sao ba diem a b d thang hang? b)ke duong thang moi duong thang di qua it nhat 5 diem tren c)ke ten cac duong thang trong hinh ve

Ve 5 diem A,B,C,D sao cho 3 diem A,B,C thang hang, 3 diem B,C,D thang hang, 3 diem C,D,E khong thang hang

a) Giai thich vi sao 3 diem A,B,D thang hang

b) Tren hinh ve hay tim diem nam giua 2 diem con lai

a) ve nam diem M,N,P,Q,R sao cho ba diem M,N,P thang hang,ba diem N,P,Q thang hang ,con ba diem N,P,R khong thang hang b) ke cac duong thang di qua cac cap diem.Co bao nhieu duong thang,ke ten cac duong thang do c)co bao nhieu doan thang?ke ten cac doan thang do d)ke ten cac tia goc P.Trong cac tia do chi ra hai tia doi nhau ? hai tia trung nhau?

a/Cho ba diem A,B,C thang hang thi co may truong hop hinh ve?

b/Trong moi truong hop,co may diem nam giua hai diem con lai?

c/Hay noi cach ve ba diem khong thang hang

cho 3 diem A,B,C, khong thang hang,ve doan thang BC

ve diem M la trung diem cua doan thang BC

ve tia BA,duong thang AC

ve duong thang AD sao cho M nam giua A va D

cho ba diem a,b,c khong thang hang ve duong thang ab tia ac doan thang bc diem m nam giua b va c

lay ba diem khong thang hang a,b,c .ve hai tia ab,ac.ve hai tia ab , ac

a, ve tia ay cat duong thang bc tai diem m nam giua b va c

b,ve tia ay cat duong thang bc tai diem n khong nam giua b va c

Ve hinh theo cach dien dat sau:

a, diem M nam giua hai diem A va B: diem N khong nam giua hai diem A va B (ba diem N,A,B thang hang)

b, Diem B nam giua hai diem A va N; diem M nam giua hai diem A va B

Lay ba diem khong thang hang A,B,C . Ve hai tia AB,Ac .a)Ve tia Ax cat dung thang BC tai diem M nam giua B va C