ACAD R14 has this feature. Look under Tools, Inquiry, Mass Properties.
From: Fountain Conner [mailto:fconner(--nospam--at)pcola.gulf.net]
Sent: Thursday, February 10, 2000 12:45 PM
Subject: Off topic, Moment of Inertia
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.
Fountain E. Conner, P.E.
1724 Beaver Pond Rd.
Gulf Breeze, Fl. 32561