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 September 27th, 2018, 09:35 PM #1 Senior Member   Joined: Nov 2011 Posts: 248 Thanks: 3 diagonal Are the concepts of external and internal diagonals defined in solid body?
 September 28th, 2018, 02:10 PM #2 Global Moderator   Joined: May 2007 Posts: 6,684 Thanks: 659 I don't see why not.
 September 29th, 2018, 01:03 AM #3 Senior Member   Joined: Nov 2011 Posts: 248 Thanks: 3 Can you give examples to questions with these concepts? [A link can be very useful...]
 September 29th, 2018, 02:13 AM #4 Senior Member   Joined: Jun 2015 From: England Posts: 891 Thanks: 269 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 Re-entrant 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 02:18 AM.

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