TikZ drawing triangulation

Question

Can anyone help reproducing this on TIKZ?

rpapa · Accepted Answer

a solution with two foreach loops
documentclass{article}

usepackage{tikz}
usetikzlibrary{calc}

begin{document}
begin{tikzpicture}

foreach aa in {0,1,2,...,5}{
    draw (0,0)coordinate(O) -- ({aa*360/5}:2)coordinate(Paa);
}

draw 
(P0) 
foreach aa in  {1,2,...,5}{--
(Paa)
}
-- cycle;
draw[fill] (O) circle (1mm);
end{tikzpicture}

end{document}

Sebastiano · Answer

A fast solution that you can create yourself with a tool called mathcha.
documentclass[12pt]{article}
usepackage{amsmath}
usepackage{tikz}
begin{document}
tikzset{every picture/.style={line width=0.75pt}}
begin{tikzpicture}[x=0.75pt,y=0.75pt,yscale=-1,xscale=1]
draw   (259.15,107.06) -- (342.34,167.5) -- (310.57,265.29) -- (207.74,265.29) -- (175.97,167.5) -- cycle ;
%Straight Lines [id:da5500931558328854] 
draw    (259.15,107.06) -- (259.15,194.53) ;
%Straight Lines [id:da9807314972174233] 
draw    (175.97,167.5) -- (259.15,194.53) ;
%Straight Lines [id:da4619344120764781] 
draw    (342.34,167.5) -- (259.15,194.53) ;
%Straight Lines [id:da9720784168022731] 
draw    (259.15,194.53) -- (207.74,265.29) ;
%Straight Lines [id:da3200168995877415] 
draw    (259.15,194.53) -- (310.57,265.29) ;
%Shape: Circle [id:dp3653706700614776] 
draw  [fill={rgb, 255:red, 0; green, 0; blue, 0 }  ,fill opacity=1 ] (254.65,194.53) .. controls (254.65,192.04) and (256.67,190.03) .. (259.15,190.03) .. controls (261.64,190.03) and (263.65,192.04) .. (263.65,194.53) .. controls (263.65,197.02) and (261.64,199.03) .. (259.15,199.03) .. controls (256.67,199.03) and (254.65,197.02) .. (254.65,194.53) -- cycle ;
draw (268,190.4) node [anchor=north west][inner sep=0.75pt]    {large $A_{i}$};
end{tikzpicture}
end{document}

Zarko · Answer

If drawn shape is regular pentagon, than I would exploit TikZ library regular polygon (see TikZ and PGF manual, pp 792, version 3.1.7a):
documentclass[tikz, margin=3.14159]{standalone}
usetikzlibrary{shapes.geometric}

begin{document}
    begin{tikzpicture}
node (s)   [regular polygon, regular polygon sides=5, draw,
             minimum size=33mm] {$bullet$};
foreach i in {1,2,...,5}
    draw (0,0) -- (s.corner i);
    end{tikzpicture}
end{document}

TikZ drawing triangulation

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