Posted by Jack30 on Mar 29, 2022; 7:45am
URL: https://forum.librecad.org/Surfaces-tp5721605p5721610.html

Hi,
I'm not a skilled user too . For the surface of a quadrilateral (a slightly twisted room) ABCD, I use these formulas :
 
2S = abs((xA-xC)*(yB-yD)) + abs((xB-xD)*(yA-yC)) Where xM,yM are the coordinate off M point...

I need  to copy manually each coordinate > Excel :( Is there a function for this ?

Or 2S = D * (H1 + H2) Where D is the diagonal BD and Hx the heights on D of A and C
I need to create 3 new lines and  > Excel ...

http://villemin.gerard.free.fr/GeomLAV/Carre/QuadAire.htm



If a programmer can look into :)

Sorry for my poor English