Planes in Spherical Coordinates

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\documentclass[border=3pt]{standalone}
%Drawing
\usepackage{tikz}
%3D
\usepackage{tikz-3dplot}
%Tikz Library
\usetikzlibrary{angles, quotes, intersections}
%Styles
\tikzset{axis/.style={thick,-latex}}
\tikzset{vec/.style={thick,blue}}
\tikzset{univec/.style={thick,red,-latex}}
%Notation
\usepackage{physics}
\usepackage{bm}
\begin{document}
    %Layers
    \pgfdeclarelayer{background}
    \pgfdeclarelayer{foreground}
    \pgfsetlayers{background, main, foreground}
    
    \tdplotsetmaincoords{70}{110}
    %
    \pgfmathsetmacro{\thetavec}{48.17}
    \pgfmathsetmacro{\phivec}{63.5}
    %
    
    \begin{tikzpicture}[tdplot_main_coords]
        %Areas
        \begin{pgfonlayer}{main}
            \path[opacity=0.5, fill=black!20] (0,0,0) -- ++(11.5,0,0) -- ++(0,9,0) -- +(-11.5,0,0) -- cycle;
            \path[opacity=0.5, fill=blue!20] (0,0,0) -- (2,4,0) -- (10.1,0,0) -- cycle;
            \path[opacity=0.5, fill=red!20] (0,0,0) -- (2,4,4) -- (3.6,7.2,0) -- cycle;     
        \end{pgfonlayer}
 
 
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