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September 27th, 2018, 08:35 PM   #1
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diagonal

Are the concepts of external and internal diagonals defined in solid body?
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September 28th, 2018, 01:10 PM   #2
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I don't see why not.
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September 29th, 2018, 12:03 AM   #3
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Can you give examples to questions with these concepts?
[A link can be very useful...]
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September 29th, 2018, 01:13 AM   #4
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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 01:18 AM.
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