Observe the ruler, it is marked in inches. \
The long marks are inches, and each inch divided into sixteenths.
Point A starts at 0th inch mark and Point B is closer to inch mark.
The length of the line segment in.
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inch mark.![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=ff8d0a01c265386fe144f1ef05b04b10.png\")
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in.