if B is between A and C, then AB + BC=AC??
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Theorem: If A, B, C are distinct points in the plane, then |CA| = |AB| + |BC| if and only if the 3 points are collinear and B is between A and C (i.e., B is on segment AC).
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Theorem: If A, B, C are distinct points in the plane, then |CA| = |AB| + |BC| if and only if the 3 points are collinear and B is between A and C (i.e., B is on segment AC).
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