September 27th, 2018, 08:35 PM  #1 
Senior Member Joined: Nov 2011 Posts: 230 Thanks: 2  diagonal
Are the concepts of external and internal diagonals defined in solid body?

September 28th, 2018, 01:10 PM  #2 
Global Moderator Joined: May 2007 Posts: 6,607 Thanks: 616 
I don't see why not.

September 29th, 2018, 12:03 AM  #3 
Senior Member Joined: Nov 2011 Posts: 230 Thanks: 2 
Can you give examples to questions with these concepts? [A link can be very useful...] 
September 29th, 2018, 01:13 AM  #4 
Senior Member Joined: Jun 2015 From: England Posts: 884 Thanks: 265 
A quadrangle is a plane figure consisting of four points, each joined by at least two (possibly intersecting) lines to two others of the points. There are three types Convex where the diagonals lie inside the figure Reentrant where one diagonal is inside and one is outside Crossed if both diagonals lies outside. This can be extended to solid bodies and multidimensional bodies, they are then called non convex hulls. Last edited by studiot; September 29th, 2018 at 01:18 AM. 

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