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Off topic, Moment of Inertia

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Does anyone have an ACAD Lisp routine that will reliably calculate the
moment of inertia of a shape once it's drawn?

I tried one, but it wasn't too accurate -- even on a simple rectanguar
section.  Build-up sections were worse.

Thank you,

Fountain E. Conner, P.E.
1724 Beaver Pond Rd.
Gulf Breeze, Fl. 32561
   Phone 850-932-5547
   Fax      850-934-1916