with dimarc, quietly.
of the complete circumference no, but if you just need to cut an infinitesimal portion of the circle, so that it becomes an arc and go dimarc.
Of course, however, I must first go to "stili di quotatura" panel "unita" "formato angle" and on "unita" specify "length" right?...... This presupposes that I must have two styles of quotation, one that allows me to have the development as length of an arc and another style in case I want to quote the amplitude understood as an angle.
However, yes, you can quote but it is worth the above mentioned, in the style of quotation you must set "length" or "angle", in the first case, returns the development of a portion of circumference, in the second case the width.
must have two distinct styles. However in microstation at deferment of autocad, quotating a "arch" is not as immediate as it happens in autocad.