In geometry, the segment addition postulate states that if B is between A and C, then AB + BC = AC. The converse is also the same. If AB + BC = AC, then B is between A and C. The segment addition postulate is used often in proofs involving the congruence of segments.
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“The most important American addition to the World Experience was the simple surprising fact of America. We have helped prepare mankind for all its later surprises.”
—Daniel J. Boorstin (b. 1914)