\documentclass{standalone}
\usepackage[utf8]{inputenc}
\usepackage{amsmath}
\usepackage{amsfonts}
\usepackage{amssymb}
%\usepackage{lmodern}
\usepackage{tikz}
\author{Kenneth John Odle}

\begin{document}

\begin{tikzpicture}
 \draw [thin] circle(0.75cm);
 \filldraw [black] (0,0) circle(1pt);
\end{tikzpicture}

% Minipage environment
% See https://www.sascha-frank.com/latex-minipage.html

\begin{minipage}[t][1cm][b]{3.5cm}
	\begin{center}
	 \textbf{Circle}
	 \end{center}
	$ Area = \pi r^2 $ \\
	$ Circumference = \pi D $
\end{minipage}

\end{document}