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Can you dimension the circumferance of a circle, and a segment length?

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    Can you dimension the circumferance of a circle, and a segment length?

    Hello ! I am new to this forum, and relatively new to Revit. I have what I think is a simple dimension question, but I cannot seem to figure it out. Please see attached image, I just want to know if it is possible to dimension the circumference of a circle (and modify to be 48"), and also is it possible to dimension a segment of circle, in order to make it a set distance? I have highlighted in orange the two locations I am trying to dimension, so I can end up with specific numbers. Thank you in advance, I am sure this community has far more expertise than myself !!! madeline
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    #2
    There are 2 different questions here. Let me start with the first one, about the circle:

    Revit does not have that kind of dimension that you show in your sketch: a dimension that shows the circumference of a circle. However, Revit provides the value of the circumference. Click on the circle, and see its instance properties; the Length parameter is the circumference of the circle.

    Now, if you want to control a circle by its circumference, you need to create a family, and add a formula that changes the radius of the circle, based on the desired circumference.

    See illustration.
    Attached Files
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      #3
      The second question is about arcs, and the length of the arc.

      Yes, Revit provides a tool to dimension the length of an arc. Annotate > Arc Length. Click on the arc, then click on the lines or reference planes that intersect the arc.

      If you want to set the arc length to a certain value, enter the cursor in the arc length dimension, and type a new value. The arc will change.
      Also, if you click on an arc and see its instance properties, the Length parameter shows the length of the arc.

      Now, if you want to control the length of an arc with parameters, you need a family with a formula, to change the angle of the arc, based on the desired arc length and radius.

      See illustration.
      Attached Files
      Last edited by Alfredo Medina; August 19, 2017, 12:24 AM.
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