How can I add slant height to this cone?

Question

I found code by someone else on creating a cone which I copy pasted below. However, I want to also add an arrow (<-->) for the slant height and label it "l". However, I am unsure of how to do it. May someone please help me?

\documentclass[a4paper, 12pt]{article}
\usetikzlibrary{positioning, calc}
\begin{document}
\begin{tikzpicture}
\newcommand{\radiusx}{2}
\newcommand{\radiusy}{.5}
\newcommand{\height}{6}
\coordinate (a) at (-{\radiusxsqrt(1-(\radiusy/\height)(\radiusy/\height))},{\radiusy*(\radiusy/\height)});
\coordinate (b) at ({\radiusxsqrt(1-(\radiusy/\height)(\radiusy/\height))},{\radiusy*(\radiusy/\height)});
\draw[fill=gray!30] (a)--(0,\height)--(b)--cycle;
\fill[gray!50] circle (\radiusx{} and \radiusy);
\begin{scope}
\clip ([xshift=-2mm]a) rectangle ($(b)+(1mm,-2*\radiusy)$);
\draw circle (\radiusx{} and \radiusy);
\end{scope}
\begin{scope}
\clip ([xshift=-2mm]a) rectangle ($(b)+(1mm,2*\radiusy)$);
\draw[dashed] circle (\radiusx{} and \radiusy);
\end{scope}
\draw[dashed] (0,\height)|-(\radiusx,0) node[right, pos=.25]{$h$} node[above,pos=.75]{$r$};
\draw (0,.15)-|(.15,0);
\end{tikzpicture}
\end{document}

You can read the TikZ manual to learn it properly, if you want to. (or documentation - What is the minimum one needs to know to use TikZ? - TeX - LaTeX Stack Exchange ) — user202729, Nov 16 '21 at 16:58

score 1 · Answer 1 · answered Nov 16 '21 at 17:15

Simply add another \draw as follows:

\documentclass[a4paper, 12pt]{article}
\usepackage{tikz}
\usetikzlibrary{positioning, calc}
\begin{document}
\begin{tikzpicture}
\newcommand{\radiusx}{2}
\newcommand{\radiusy}{.5}
\newcommand{\height}{6}
\coordinate (a) at (-{\radiusx*sqrt(1-(\radiusy/\height)*(\radiusy/\height))},{\radiusy*(\radiusy/\height)});
\coordinate (b) at ({\radiusx*sqrt(1-(\radiusy/\height)*(\radiusy/\height))},{\radiusy*(\radiusy/\height)});
\draw[fill=gray!30] (a)--(0,\height)--(b)--cycle;
\fill[gray!50] circle (\radiusx{} and \radiusy);
\begin{scope}
\clip ([xshift=-2mm]a) rectangle ($(b)+(1mm,-2*\radiusy)$);
\draw circle (\radiusx{} and \radiusy);
\end{scope}
\begin{scope}
\clip ([xshift=-2mm]a) rectangle ($(b)+(1mm,2*\radiusy)$);
\draw[dashed] circle (\radiusx{} and \radiusy);
\end{scope}
\draw[dashed] (0,\height)|-(\radiusx,0) node[right, pos=.25]{$h$} node[above,pos=.75]{$r$};
\draw (0,.15)-|(.15,0);
\draw [<->] (\radiusx+1,0) -- (1,\height) node[midway,right] {label};%<--
\end{tikzpicture}
\end{document}

How can I add slant height to this cone?

1 Answers1