How can I fix extruded polygon corners?

Question

I'm working with tkz-euclide and I'm having a problem with the corners of each inscribed triangle sticking out of the circumference of the circle. This is what it looks like:

... and this is the code I used:

\documentclass[convert]{standalone}
\usepackage{tkz-euclide}
\begin{document}
\begin{tikzpicture}
\tkzDefPoints{0/0/O, 3/0/P, 3/0/R}
\tkzDrawCircle(O,P)
\tkzDrawPoint(O)
\tkzLabelPoints(O)
\foreach \i in {0,...,2}
{
    \tkzDefPointOnCircle[angle=120\i ,center=O,radius=3]
    \tkzGetPoint{P}
    \tkzDefPointOnCircle[angle=120\i + 120,center=O,radius=3]
    \tkzGetPoint{R}
    \tkzDrawPolygonfill=blue!20!white
}
\end{tikzpicture}
\end{document}

I understand this is only a small bit of detail, but I would like to know how I can fix this in case other people have this problem too. Thanks in advance!

@hpekristiansen Isn't it compilable? You could just copy and paste the code between the \begin{document} and \end{document} tags, and don't forget to import the tkz-euclide package right? — Kookie, Nov 16 '20 at 14:15

score 4 · Accepted Answer · answered Nov 16 '20 at 14:22

This question is probable a duplicate. You can change the line join to a type that is more suitable - see: In TikZ when is "line join=miter" the preferrable over "line join=round"?

\documentclass[convert]{standalone}
\usepackage{tkz-euclide}
\begin{document}
\begin{tikzpicture}
\tkzDefPoints{0/0/O, 3/0/P, 3/0/R}
\tkzDrawCircle(O,P)
\tkzDrawPoint(O)
\tkzLabelPoints(O)
\foreach \i in {0,...,2}
{
    \tkzDefPointOnCircle[angle=120\i ,center=O,radius=3]
    \tkzGetPoint{P}
    \tkzDefPointOnCircle[angle=120\i + 120,center=O,radius=3]
    \tkzGetPoint{R}
    \tkzDrawPolygonfill=blue!20!white, line join=round
}
\end{tikzpicture}
\end{document}

Oh, I wasn't aware of this. Thanks! – Kookie Nov 16 '20 at 14:24 — Kookie, Nov 16 '20 at 14:24

score 3 · Answer 2 · answered Nov 16 '20 at 14:24

You should adapt the join type:

\documentclass[convert]{standalone}
\usepackage{tkz-euclide}
\begin{document}
    \begin{tikzpicture}
        \tkzDefPoints{0/0/O, 3/0/P, 3/0/R}
        \tkzDrawCircle(O,P)
        \tkzDrawPoint(O)
        \tkzLabelPoints(O)
    \foreach \i in {0,...,2}
    {
        \tkzDefPointOnCircle[angle=120*\i ,center=O,radius=3]
        \tkzGetPoint{P}
        \tkzDefPointOnCircle[angle=120*\i + 120,center=O,radius=3]
        \tkzGetPoint{R}
        \tkzDrawPolygon[fill=blue!20!white,line join=bevel](O,P,R)
    }

\end{tikzpicture}

\end{document}

How can I fix extruded polygon corners?

2 Answers2