This formula doesn't works for room which has columns sizes projecting out of walls...try it creating a room of 10' x 10' with 9" thick walls and place 4 columns with 1' x 18" on corners and then calculate...it wont work
Yes. The reason is because it calculates dimensions using the area and perimeter, so if the walls are angular, curved, or polyshaped; it will give an incorrect dimension value
@Kumar Kapadia you're right, sometimes if that's the case just opt for the regular room tag w area and in the room schedule under the dimensions tab manually type unable to get accurate dimensions or something
You need to download the content library! www.autodesk.com/support/technical/article/caas/sfdcarticles/sfdcarticles/Where-to-find-Revit-Content-Libraries-to-download.html