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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.
