este fater bun preten de gogafira
        
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             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 
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        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:)
PS-tricks 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):