If B is _____ A and C, then AB+BC=CA
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If B is on the line segment AC, then AB + BC = AC.
This is a basic concept of geometry that is known as the Segment Addition Postulate. The postulate states that if there are three points A, B, and C that are collinear (on the same line), and B is between A and C, then the sum of the lengths of AB and BC will equal the length of AC.
So, if B is on the line segment AC, then AB + BC = AC by the Segment Addition Postulate.
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