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?
Tren duong thang xy lay 4 diem A,O,B,E sao cho O nam giua A va B , B nam giua O va E . Hay ke ten :
a) cac cap tia doi nhau
b) cac tia goc A trung nhau , cac tia goc O trung nhau
c0 Co bao nhieu tia phan biet tren hinh ve ?
Cho goc xOy va goc yOz ke bu nhau, ve tia Om la tia phan giac cua goc xOy va tia On la tia phan giac cua goc yOz
a) Tinh goc mOn.
b) Ve tia Om' la tia doi cua tia Om, neu goc zOm' = 30 do. Tinh goc m'Oy.
c) Ve duong thang d khong di qua diem O, tren duong thang d lay 2015 diem phan biet. Tinh so goc co dinh la diem O va cac canh di qua 2015 diem tren duong thang d.
Cho goc xOy va goc yOz ke bu nhau, ve tia Om la tia phan giac cua goc xOy va tia On la tia phan giac cua goc yOz
a) Tinh goc mOn.
b) Ve tia Om' la tia doi cua tia Om, neu goc zOm' = 30 do. Tinh goc m'Oy.
c) Ve duong thang d khong di qua diem O, tren duong thang d lay 2015 diem phan biet. Tinh so goc co dinh la diem O va cac canh di qua 2015 diem tren duong thang d.
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
cho cac diem A va B thuoc duong thang a .diem C nam giua A va B .diem D nam giua C va B
a)tim tren duong thang a nam cung phia doi voi diem C diem nam khac phia doi voi diem C
b) tim tren hinh ve cac tia doi nhau goc C ,cac tia trung nhau goc C
c) vi sao diem C nam giua A va D
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!
Ve duong thang xy di qua diem M, lay hai diem P va Q sao cho diem P thuoc tia Mx, diem Q thuoc tia Py nhung khong thuoc tia My. hay viet ten
a) Tia trung voi tia Py
b) cac tia goc Q trung nhau
c) Cac tia goc Q doi nhau
d) Tat ca cac doan thang trong hinh
Ve hai diem A va B cung thuoc duong thang xy va diem C khong thuoc duong thang xy .Ve tia BC
a.ke ten cac doan thang
b.ke ten hai tia doi nhau goc B
c.ve diem D nam giua hai diem A va B . hoi hai tia DX va BY co la hai tia doi nhau ko ? vi sao ?