# Tikz Package: Drawing Arcs on Circles

Source: tikz manual on bu.edu

What does \draw (60:5pt) indicate?

• 5pt from the origin at 60 degrees of direction.
– user226564
Commented Feb 21, 2021 at 4:59
• it is polar coordinate: 60 indicates the polar angle, 5pt indicate the polar radius. The update PGFmanual is here ctan.org/pkg/pgf Commented Feb 21, 2021 at 5:07
• @Jaxx hopefully the answer below will clarify -- moving at 30 degrees or 45 degrees would coincide the smaller arc with the bigger arc -- also note the shift syntax which clarifies the movement at an angle -- note also the bigger arc has been drawn with one definition of  arc(90:390:1cm) giving the same result -- the author has I believe split into two arcs to help visualize the big and small arc Commented Feb 22, 2021 at 1:26

\documentclass{article}
\usepackage{tikz}

\begin{document}

\begin{tikzpicture}
\draw[help lines] (0,0) grid (4,3);
\draw [blue]([shift=(60:5pt)]0,0){}--+(30:1cm) arc(30:90:1cm)--cycle;
\draw [red](0,0)--(90:1cm) arc(90:390:1cm)--cycle;
\end{tikzpicture}

\begin{tikzpicture}
\draw[help lines] (0,0) grid (4,3);
\draw [blue]([shift=(30:5pt)]0,0){}--+(30:1cm) arc(30:90:1cm)--cycle;
\draw [red](0,0)--(90:1cm) arc(90:390:1cm)--cycle;
\end{tikzpicture}

\begin{tikzpicture}
\draw[help lines] (0,0) grid (4,3);
\draw [blue]([shift=(90:5pt)]0,0){}--+(30:1cm) arc(30:90:1cm)--cycle;
\draw [red](0,0)--(90:1cm) arc(90:390:1cm)--cycle;
\end{tikzpicture}
\end{document}