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a, Các tia trùng với tia OB là: AB; AC; OC.
b, Ox và By không phải là 2 tia đối nhau vì 2 tia này không có chung gốc.
c, Các đoạn thẳng trên đường thẳng xy: AO; AB; AC; OB; OC; BC.
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a) Các cặp tia đối nhau là:
+ Ax và Ay
+ Ox và Oy
+ Bx và By
+ Ex và Ey
b) Các tia trùng nhau gốc A là: AO, AB, AE, Ay.
Các tia trùng nhau gốc O là: OB, OE, Oy.
c) Theo câu a ta có 4 cặp góc đối nhau
\(\Rightarrow\) Có tất cả 8 tia phân biệt.
a)hinh tao thanh boi diem O va 1 phan duong thang bi chia ra boi diem Oduoc goi la 1 tia gốc O
b)diem R bat ki nam tren duong thang xy la goc chung cua 2 tia đối nhau
c)neu diem A nam giua 2 diem B va C thi:
-hai tia......AB và CA........doi nhau
-hai tia CA va ..........CB.............trung nhau
-hai tia BAva BC ........trùng nhau......
bạn nhấn đúng cho mình nhé , cảm ơn,