File:Fermat Point Proof.svg

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Fermat_Point_Proof.svg‎ (SVG file, nominally 350 × 400 pixels, file size: 29 KB)

[edit] Summary

Proving the construction of Fermat Point is valid:

We have to prove the three lines constructed are concurrent. The red and blue triangle are congruent by S.A.S. , and hence the angles in the same segment are the same, which shows that there are two cyclic quadrilaterals. Thus the last four points are also concyclic, and by angle in the same segment the last line is a straight line.

N.B. all information are included in the metadata of this svg file.

[edit] Source

The source is licensed under the same license as the image. Feel free to edit, fix, or improve it!

[edit] fermat_point_proof.euk

frame(-2.8, -6, 8.2, 7.5)
B C A triangle(6, 75:, 35:)
C B P equilateral
A C Q equilateral
B A R equilateral
s = segment(A, P)
t = segment(B, Q)
u = segment(C, R)
c = circle(B, A, R)
d = circle(A, C, Q)
e = circle(C, B, P)
F = intersection(line(A, P), line(B, Q))

color(green)
draw(c)
color(cyan)
draw(d)
color(blue)
draw(t)
draw(segment(A, Q))
draw(segment(A, B))
mark(segment(A, B), simple)
mark(segment(A, Q), double)
mark(B, A, Q, simple, 1.2)
color(red)
draw(u)
draw(segment(A, R))
draw(segment(A, C))
mark(segment(A, R), simple)
mark(segment(A, C), double)
mark(R, A, C, simple, 0.8)
color(black)
draw(s)
draw(segment(B, R))
draw(segment(C, Q))
draw(C, B, P)
draw(e, dashed)
draw(F, dot, 1.3)
mark(segment(B, R), simple)
mark(segment(C, Q), double)
mark(segment(B, C), triple)
mark(segment(B, P), triple)
mark(segment(C, P), triple)
mark(C, R, A, double, 1.5)
mark(Q, B, A, double, 1.5)
mark(A, Q, B, triple, 1.5)
mark(A, C, R, triple, 1.5)
mark(B, F, P, dot, 0.8)
mark(B, C, P, dot, 0.8)
label(F, 0.5, 0:)
label(A, 0.5, 90:)
label(B, 0.5, 225:)
label(C, 0.5, 330:)
label(P, 0.3, 270:)
label(Q, 0.3, 0:)
label(R, 0.3, 90:)

[edit] Instruction

Run eukleides and compile it into en:PSTricks.
Paste the resulting code in the following en:TeX file and compile it into eps.

\documentclass{article}
\usepackage{pstricks}
\usepackage{color}

\begin{document}
\pagestyle{empty}
\colorbox{white}{

%Paste the code here

}
\end{document}

Import the eps file using en:Scribus. (Remember to install en:ghostscript also and configure the path to ghostscript correctly in Scribus's Preferences)
And then export it to en:svg.
Post-process using en:Inkscape.

[edit] Licensing

I, the copyright holder of this work, hereby publish it under the following licenses:

Permission is granted to copy, distribute and/or modify this document under the terms of the GNU Free Documentation License, Version 1.2 or any later version published by the Free Software Foundation; with no Invariant Sections, no Front-Cover Texts, and no Back-Cover Texts. A copy of the license is included in the section entitled "GNU Free Documentation License".

This file is licensed under the Creative Commons Attribution ShareAlike 2.5, Attribution ShareAlike 2.0 and Attribution ShareAlike 1.0 License. In short: you are free to share and make derivative works of the file under the conditions that you appropriately attribute it, and that you distribute it only under a license identical to this one.

You may select the license of your choice.

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	Date/Time	Thumbnail	Dimensions	User	Comment
current	01:22, 11 March 2006		350×400 (29 KB)	Lemontea (Talk \| contribs)	(Proving the construction of Fermat Point is valid: We have to prove the three lines constructed are concurrent. The red and blue triangle are congruent by S.A.S. , and hence the angles in the same segment are the same, which shows that there are two cycl)