Скачать или смотреть How to use Room Tag with Dimension in Revit || Room Tag Dimension family in Revit.

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Formula:
For Length:
if(Area = (Perimeter / 4) ^ 2, Perimeter / 4, ((Perimeter / 2) - sqrt((Perimeter / 2) ^ 2 - 4 * Area)) / 2)
For Width:
Area / Length

Steps:
Open -- Family -- Room tags from annotations folder.
Create tab, click Label. click Fx (formula) button. Name the Value "Length", change type to "length" and enter the formula:
if(Area = (Perimeter / 4) ^ 2, Perimeter / 4, ((Perimeter / 2) - sqrt((Perimeter / 2) ^ 2 - 4 * Area)) / 2)
then ok.
Now click Fx (formula) button again. Name the Value "Width", change type to "length" and enter the formula:
Area / Length
then ok.
You can add a "x" for the prefix in the width line.
then Ok. Save Tag family and Load it into your project.
Thanks!!!

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