este fater bun preten de gogafira
Licensing
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 FrontCover Texts, and no BackCover 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


Based on Image:Angle acute obtuse straight.png, which was donated to Wikipedia Commons under GFDL by en:User:Eddideigel.
Source
Created by Gustavb using Eukleides.
Angle_obtuse_acute_straight.euk (Eukleides source)
box(.1,.35,1.45,.55,2)
thickness(2)
A = point(0,0);
B = point(.5,0);
C = point(1.7,1);
D = point(1,0);
draw(line(A,B))
draw(B,C);
thickness(1.2)
mark(C,B,A,simple,.42)
mark(D,B,C,simple,.55)
mark(A,B,D,simple,.3)
draw("$b>90^\circ$",B,.24,90:)
draw("$a<90^\circ$",B,.3,20:)
draw("$c=180^\circ$",B,.17,300:)
PStricks source
\psset{linecolor=black, linewidth=.5pt, arrowsize=2pt 4}
\psset{unit=2.0000cm}
\pspicture*(0.1000,0.3500)(1.4500,0.5500)
\psset{linewidth=1.0000pt}
\psline(0.1000,0.0000)(1.4500,0.0000)
\psline(0.5000,0.0000)(1.7000,1.0000)
\psset{linewidth=0.6000pt}
\psarc(0.5000,0.0000){0.2100}{39.8056}{180.0000}
\psarc(0.5000,0.0000){0.2750}{0.0000}{39.8056}
\psarc(0.5000,0.0000){0.1500}{180.0000}{0.0000}
\uput{0.2400}[90.0000](0.5000,0.0000){$b>90^\circ$}
\uput{0.3000}[20.0000](0.5000,0.0000){$a<90^\circ$}
\uput{0.1700}[300.0000](0.5000,0.0000){$c=180^\circ$}
\endpspicture
Instructions
 Create EPS
$ euk2eps Angle_obtuse_acute_straight.euk
 Outline fonts
$ eps2eps dNOCACHE Angle_obtuse_acute_straight.eps Angle_obtuse_acute_straight2.eps
 Fix bounding box
$ ps2epsi Angle_obtuse_acute_straight2.eps Angle_obtuse_acute_straight.eps
 Convert to Sketch
$ pstoedit f sk Angle_obtuse_acute_straight.eps Angle_obtuse_acute_straight.sk
 Convert to SVG
$ skconvert Angle_obtuse_acute_straight.sk Angle_obtuse_acute_straight.svg
 Fix Angle_obtuse_acute_straight.svg with Inkscape
The following pages on Schools Wikipedia link to this image (list may be incomplete):