Click Line
in the Profile toolbar.
Click Symmetrical
that appears in the Sketch tools
toolbar.
Click the center point of the line which is to be assigned
a symmetrical extension.
Drag the cursor to the desired location.
The median appears. It is perpendicular to the line, at the line midpoint.
Click to locate the symmetrical extension.
The median is created. If needed, move the symmetrical
extension to a new position.
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