Version 1
: Received: 30 August 2021 / Approved: 31 August 2021 / Online: 31 August 2021 (11:04:18 CEST)
Version 2
: Received: 17 February 2023 / Approved: 21 February 2023 / Online: 21 February 2023 (03:35:09 CET)
How to cite:
Cabeza Lainez, J. A Meaning for the Second Power of the Number Pi. Determining the Surface of a Regular Conoid by Virtue of Ramanujan’s Approximation. Preprints2021, 2021080557. https://doi.org/10.20944/preprints202108.0557.v1
Cabeza Lainez, J. A Meaning for the Second Power of the Number Pi. Determining the Surface of a Regular Conoid by Virtue of Ramanujan’s Approximation. Preprints 2021, 2021080557. https://doi.org/10.20944/preprints202108.0557.v1
Cabeza Lainez, J. A Meaning for the Second Power of the Number Pi. Determining the Surface of a Regular Conoid by Virtue of Ramanujan’s Approximation. Preprints2021, 2021080557. https://doi.org/10.20944/preprints202108.0557.v1
APA Style
Cabeza Lainez, J. (2021). A Meaning for the Second Power of the Number Pi. Determining the Surface of a Regular Conoid by Virtue of Ramanujan’s Approximation. Preprints. https://doi.org/10.20944/preprints202108.0557.v1
Chicago/Turabian Style
Cabeza Lainez, J. 2021 "A Meaning for the Second Power of the Number Pi. Determining the Surface of a Regular Conoid by Virtue of Ramanujan’s Approximation" Preprints. https://doi.org/10.20944/preprints202108.0557.v1
Abstract
Unlike the volume, the expression for the lateral area of a regular conoid has not yet been obtained by means of direct integration or a differential geometry procedure. As this form is relatively used in engineering, the inability to determine its surface, represents a serious hindrance for several problems which arise in radiative transfer, lighting and construction, to cite just a few. Since this particular shape can be conceived as a set of linearly dwindling ellipses which remain parallel to a circular directrix, a typical problem appears when looking for the length of such ellipses. We conceived a new procedure which, in principle, consists in dividing the surface into infinitesimal elliptic strips to which we have subsequently applied Ramanujan’s second approximation. In this fashion, we can obtain the perimeter of any ellipse pertaining to the said form as a function of the radius of the directrix and the position of the ellipse’s center on the X-axis. Integrating the so-found perimeters of the differential strips for the whole span of the conoid, an unexpected solution emerges through the newly found number psi (ψ). As the strips are slanted in the symmetry axis, their width is not uniform and we need to perform some adjustments in order to complete the problem with sufficient precision. Relevant implications for technology, building science, radiation and structure are derived in the ensuing discussion.
Keywords
Conoid; Ellipse; Ramanujan; Calculus of surface areas; number Psi; number Pi; 3D-construction of complex Geometries; Engineering Design Objects; Architectural Forms.
Subject
Computer Science and Mathematics, Applied Mathematics
Copyright:
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.