With this function, diameters of arcs and holes can (in the page view two parallel lines) be measured. There are two different procedures for this, steps a) and b):

Steps:
a for the freehand selection mode
b for the other modes

1a.	Click on an arc.
2a.	Select the dimension text position or enter the coordinates.
fi	A diameter dimension is drawn.
1b.	Select the first dimension point or enter the coordinates.
2b.	Select the second dimension point or enter the coordinates.
3b.	Select the dimension text position or enter the coordinates.
fi	A diameter dimension is drawn, with the symbol “Ø” automatically added.