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\documentclass{article}
\usepackage[UTF8]{ctex}
\usepackage{fancyhdr}
\usepackage{graphicx}
\usepackage{amsmath}
\usepackage{tasks}
\usepackage{geometry}
\usepackage{float}
\usepackage{tikz}
\geometry{a4paper,left=2cm,right=2cm,top=1.5cm,bottom=1.5cm}
\pagestyle{fancy}
\lhead{}
\chead{}
\rhead{}
\lfoot{}
\cfoot{}
\rfoot{\thepage}
\renewcommand{\headrulewidth}{0.4pt}
\renewcommand{\footrulewidth}{0.4pt}
\linespread{1.35}
\begin{document}
\begin{tikzpicture}[scale=1.5,line width=1pt]
%A-D-C
\draw[dashed,fill=blue!20](1.414,0,0)node[below]{$A$}--(-1.414,0,0)node[below]{$D$}--(-1.414,2,0)node[right]{$C$};
%P-D
\draw[dashed,red](0,0,1.414)--(-1.414,0,0);
%P-A-B-C-P-B
\draw(0,0,1.414)node[above]{$P$}--(1.414,0,0)--(1.414,2,0)node[below]{$B$}--(-1.414,2,0)--(0,0,1.414)--(1.414,2,0);
\end{tikzpicture}
\end{document}
