Autodesk 057B1-41A111-1001 - AutoCAD LT 2010, Руководство пользователя

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For horizontal dimension text, if the angle of the radial dimension line is
greater than 15 degrees from horizontal, a hook line, also called a dogleg or
landing, one arrowhead long, is created next to the dimension text.
Control Extension Lines
When an arc is dimensioned, the radial or diametric dimension does not have
to be positioned along the arc directly. If a dimension is positioned past the
end of an arc, either an extension line will be drawn that follows the path of
the arc being dimensioned or no extension line will be drawn. When the
extension line is suppressed (off), the dimension line of the radial or diametric
dimension is drawn through the center point of the arc instead of to the
extension line.
The DIMSE1 system variable controls whether or not a radial or diametric
dimension will be drawn with an extension line when it is positioned off the
end of an arc. When the display of the arc extension line is not suppressed,
a gap between the arc and arc extension line is made. The size of the gap
drawn is controlled with the DIMEXO system variable.
Dimensions and Tolerances | 403