Title section with tikz

Question

using the TikZ package to create a style for book sections like the image below?

Answer 1

I believe I got a somewhat more organized.

\documentclass{book}
\usepackage[explicit]{titlesec}
\usepackage{tikz}
\usetikzlibrary{shapes,shadows,calc}
\usetikzlibrary{positioning,calc}
\usepackage{lipsum}
\usepackage[hmargin=0.5in,bmargin=1in,tmargin=1in,centering]{geometry}

\definecolor{cor1}{HTML}{57C3CF}
\definecolor{cor2}{HTML}{4EA8B1}


\newcommand\SecTitle[4]{%
\begin{tikzpicture}

    \node (A) [rectangle,minimum width=\textwidth, minimum height=1cm,color=white,fill=cor2, text width=\textwidth-3cm,align=left] {\hspace{1.5cm}\parbox{\textwidth}{\huge\textbf{\textsf{#4}}}};
    \fill[fill=cor1] (A.north west) -- ($(A.north west)+(1.5cm,0)$) -- ($0.5*(A.north west)-0.5*(A.north west)-(0.5*\textwidth-2.5cm,0)$)--($(A.south west)+(1.5cm,0)$)--(A.south west);
    \node [color=white](A.north west) at ($0.5*(A.north west)-0.5*(A.north west)-(0.5*\textwidth-1cm,0)$) {\Huge\textbf{\textsf{\thesection}}};

\end{tikzpicture}

}
\titleformat{\section}
{\normalfont}{}{0em}
{\SecTitle{east}{west}{0\paperwidth}{#1}}

\begin{document}

\chapter{Teste}

\section{Test Section One}
\lipsum[2]
\section{Test Section Tt Section Tt Section Tt Section Tt Section Tt Section Tt Section Tt Section Tt Section Tt Section Tt Section Tt Section Tt Section Tt Section Tt Section Tt Section Tt Section Tt Section Tt Section Two}
\lipsum[2]
\clearpage
\section{Test Section Three}
\lipsum[2]
\section{Test Section Four}
\lipsum[2]

\end{document}