File:Butterfly theorem.svg

Summary[edit]

Illustration for article en:Butterfly theorem. Created by Gustavb using Eukleides

Licensing[edit]

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

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.http://www.gnu.org/copyleft/fdl.htmlGFDLGNU Free Documentation Licensetruetrue

	This file is licensed under the Creative Commons Attribution-Share Alike 3.0 Unported license.
	You are free: to share – to copy, distribute and transmit the work to remix – to adapt the work Under the following conditions: attribution – You must give appropriate credit, provide a link to the license, and indicate if changes were made. You may do so in any reasonable manner, but not in any way that suggests the licensor endorses you or your use. share alike – If you remix, transform, or build upon the material, you must distribute your contributions under the same or compatible license as the original.
	This licensing tag was added to this file as part of the GFDL licensing update.http://creativecommons.org/licenses/by-sa/3.0/CC BY-SA 3.0Creative Commons Attribution-Share Alike 3.0truetrue

Source[edit]

Butterfly_theorem.euk[edit]

box(-1.2,-1.1,1.2,1.1,2.2)
thickness(1.2)

E = circle(point(0,0),1)

A = point(E,120:)
C = point(E,60:)
P = point(E,170:)
D = point(E,210:)
B = point(E,330:)

M = intersection(line(C,D),line(A,B))
G = line(M, P)
Q P intersection(G, E)
X = intersection(line(A,D),line(P,Q))
Y = intersection(line(C,B),line(P,Q))

draw(P,Q)
draw(E)
draw(A,D,C,B,A)
draw("$A$",A,.05,120:)
draw("$C$",C,.05,50:)
draw("$P$",P,.05,190:)
draw("$Q$",Q,.05,20:)
draw("$D$",D,.05,210:)
draw("$B$",B,.05,310:)
draw("$M$",M,.1,90:)
draw("$X$",X,.05,135:)
draw("$Y$",Y,.05,60:)

mark(B,M,C,simple,.4); mark(Q,M,C,simple,.46)
mark(A,M,D,simple,.4); mark(P,M,D,simple,.46)
mark(C,D,A,simple,.5); mark(C,D,A,simple,.44); mark(C,D,A,simple,.38)
mark(C,B,A,simple,.5); mark(C,B,A,simple,.44); mark(C,B,A,simple,.38)

Instructions[edit]

1. Create EPS
   

   $ euk2eps Butterfly_theorem.euk

2. Outline fonts
   

   $ eps2eps -dNOCACHE Butterfly_theorem.eps Butterfly_theorem2.eps

3. Fix bounding box
   

   $ ps2epsi Butterfly_theorem2.eps Butterfly_theorem.eps

4. Convert to Sketch
   

   $ pstoedit -f sk Butterfly_theorem.eps Butterfly_theorem.sk

5. Convert to SVG
   

   $ skconvert Butterfly_theorem.sk Butterfly_theorem.svg

6. Fix Butterfly_theorem.svg with Inkscape