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graph having a pendent vertices

How to draw graph as shown in picture using latex

Ahmed Bilal
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    Welcome to TeX.SE! Have you already an tex code you tried? Please show it us! – Mensch May 25 '20 at 11:49
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    Welcome to TeX.SX. Questions about how to draw specific graphics that just post an image of the desired result are really not reasonable questions to ask on the site. Please post a minimal compilable document showing that you've tried to produce the image and then people will be happy to help you with any specific problems you may have. See minimal working example (MWE) for what needs to go into such a document. – dexteritas May 25 '20 at 12:14
  • The question is very likely to be closed in the next few hours (if not less). Please remember that you can ask to reopen it if you provide a MWE of what you have tried to do – Alessandro Cuttin May 25 '20 at 12:54

1 Answers1

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Welcome! This is a start.

\documentclass[tikz,border=3mm]{standalone}
\begin{document}
\begin{tikzpicture}[Dotted/.style={% https://tex.stackexchange.com/a/52856/194703
    line width=1.5pt,
    dash pattern=on 0.001\pgflinewidth off #1,line cap=round,
    shorten <=#1},Dotted/.default=6pt,
    bullet/.style={circle,fill,inner sep=1pt}]

  \draw (0,0) -- ++(2,0) node[bullet](X){}
   foreach \X in {60,40,-60} {  (X) ++ (\X:2) node[bullet]{} edge (X)};
  \draw[Dotted] (X) ++ (60:2.2) arc[start angle=60,end angle=-60,radius=2.2]
    node[midway,fill=white]{$a$};

  \draw (0,-4.5) -- ++(2,0) node[bullet](X'){}
   foreach \X in {60,40,-60} {  (X') ++ (\X:2) node[bullet]{} edge (X')};
  \draw[stealth-stealth] (X') ++ (60:2.2) 
  arc[start angle=60,end angle=-60,radius=2.2] node[midway,fill=white]{$a$};
\end{tikzpicture}
\end{document}

enter image description here

For the future please try to post some code. Otherwise others have to guess everything, and you will benefit more from the question if you show what you have tried.