Use square root in formula

[qixing.chenNYA88]

Hello,

I want to write a formula to use square root in the formula under family type to control the length. However, the square root symbol(use Alt +251) couldn't be recognized. Could anyone gives some leads?

Thank you in advance.

[mhiserZFHXS · Accepted solution]

First thing on a Google search...

https://knowledge.autodesk.com/support/revit/learn-explore/caas/CloudHelp/cloudhelp/2014/ENU/Revit/f...