Xác định vị trí tương đối của ba điểm phân biệt A,BC khi ABAC cùng phương.
Nếu ABAC cùng phương thì chúng có thể cùng hướng hoặc ngược hướng.
   Khi ABAC cùng hướng:
- Nếu |AB|>|AC| thì C nằm giữa AB.
-  Nếu |AB|<|AC| thì B nằm giữa AC.
   Khi ABAC ngược hướng thì A nằm giữa BC.

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