The Math Forum

Search All of the Math Forum:

Views expressed in these public forums are not endorsed by NCTM or The Math Forum.

Math Forum » Discussions » Math Topics » geometry.research

Notice: We are no longer accepting new posts, but the forums will continue to be readable.

Topic: Irregular Pyramids
Replies: 0  

Advanced Search

Back to Topic List Back to Topic List  

Posts: 2
From: United States
Registered: 1/16/13
Irregular Pyramids
Posted: Aug 23, 2013 1:17 PM
  Click to see the message monospaced in plain text Plain Text   Click to reply to this topic Reply

I am looking for someone to discuss irregular pyramids. I have developed formulas and methods for finding solutions given only the length of edges.

For an irregular tetrahedron, six lengths assigned to specific edges gives up to one possible solution -- formulas for this have been around as early as Piero della Francesca's solution.

For an irregular quadrilateral pyramid, eight lengths assigned to specific edges gives up to four possible solutions. I have developed a formula for this (and don't know of any others). As an example of my "research," the series (14,15,16,17,18,19,20,21) is the smallest series to give a solution for every permutation (5040). Solutions include convex, concave and complex (bow-tie) constructions.

For an irregular hexagonal pyramid, eight lengths assigned to specific edges can give many solutions. This is what I'm working on now -- finding solutions, graphing and mapping the results. Unfortunately, with 12 edges, the permutations are too large (11! = nearly 40 million) to do an extensive study of any series.

If anyone has any interest in discussion, please feel free to respond.

Message was edited by: Patrick Bell

Point your RSS reader here for a feed of the latest messages in this topic.

[Privacy Policy] [Terms of Use]

© The Math Forum at NCTM 1994-2018. All Rights Reserved.