Jet cones

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% Author: Izaak Neutelings (June, 2017)
\documentclass{article}
\usepackage{tikz}
\usepackage{tikz-3dplot}
\tikzset{>=latex} % for LaTeX arrow head
\usetikzlibrary{decorations.pathmorphing} % for snake
% colors
\definecolor{mylightred}{RGB}{255,200,200}
\definecolor{myblue}{RGB}{172,188,63}
\definecolor{mylightgreen}{RGB}{150,220,150}
% split figures into pages
\usepackage[active,tightpage]{preview}
\PreviewEnvironment{tikzpicture}
\setlength\PreviewBorder{1pt}%
\begin{document}
% 2D CONE
\begin{tikzpicture}%,scale=0.85
  % cone variables
  \def\x{2.0}
  \def\y{4.0}
  \def\R{\x}
  \def\yc{\y+0.02}
  \def\e{0.4}
  
  % cone shades + frame
  \shade[right color=white,left color=mylightgreen,opacity=0.3]
    (-\x,\yc) -- (-2,4) arc (180:360:{\R} and \e) -- (\x,\yc) -- (0,0) -- cycle;
  \draw[fill=green,opacity=0.2]
    (0,\yc) circle ({\R} and \e);
  \draw
    (-\x,\y) -- (0,0) -- (\x,\y);
  \draw
    (0,\yc) circle ({\R} and \e);
 
 
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