1. Type this following latex code in the latex editor:
% !TEX TS-program=pdflatex
% !TEX encoding=UTF-8 Unicode
%
% File name: straightAngle1.tex
% Description:
% The Straight Angle
%
% Composer: private course and tutor course
\documentclass[12pt,a4paper]{report}
\usepackage{tikz}
\usepackage{amsmath}
\usepackage{bm}
\usepackage[active,tightpage]{preview}
\PreviewEnvironment{tikzpicture}
\setlength\PreviewBorder{0.25pt}
\begin{document}
%---------------------------
% horizontal straight angle with angle in the top side
%---------------------------
\begin{tikzpicture}[scale=3.5,thick]
% Label the nodes and position
\coordinate[label=below:$\textbf{A}$] (A) at (0,0);
\coordinate[label=below left:$\textbf{B}$] (B) at (-1.5,0);
\coordinate[label=below right:$\textbf{C}$] (C) at (1.5,0);
% Draw the Angle Leg / Angle Ray
\draw (B) -- (A) node [circle,fill=black,radius=0.01,scale=0.1] {vertex};
\draw (C) -- (B) ;
% Label the sides
\node[above] at (-0.75,0) {$\textbf{a}$};
\node[below] at (-0.75,0) {\textbf{left ray}};
\node[below] at (0.75,0) {\textbf{right ray}};
\node[above] at (0.75,0) {$\textbf{b}$};
% Draw the right angle mark
\draw [thick] (0.2,0) arc(0:180:0.2);
\end{tikzpicture}
\end{document}
2. Save file as
straightAngle1.tex3. Then build or typeset the Latex code.
Output
