Kursus dan Bimbingan Belajar: Circle Theorem Using Latex 3

type this following latex code for drawing a circle theorem 3:

\documentclass[border=3mm,tikz]{standalone}

% Loading the package

\usepackage{tikz}

% Loading the library

\usetikzlibrary{positioning}

\usepackage{fourier}

\begin{document}

% Creating A Picture Using An Environment

\begin{tikzpicture}
% draw a circle
\node (C2) [draw, shape=circle, minimum size=30mm, very thick] {};

% create a diameter line
\draw[gray, very thick] (C2.north east) -- (C2.south west);

% create a diameter point
\fill[black] (C2.north east) circle (2pt) (C2.south west) circle (2pt);

% create a diameter label
\node[above, very thick, rotate=0] at (0, 0) {$\textbf{d}$};

% create a label notation description:
\node[below, very thick] at (0, -1.7) {$\textbf{d = diameter}$};

\end{tikzpicture}