basic.tex

\documentclass{article}
% \usepackage[utf8]{inputenc}
\usepackage{tikz}
\usepackage{lipsum}

\begin{document}
\lipsum[2]
\begin{tikzpicture}

\draw (0,0) -- (0,4);
\draw[thick] (0,0) -- (4,4);

% \draw[fill=red] (0,0) rectangle (3,4);

\draw (0,0) parabola (4,4);

\draw[<->] (0,0) -- (4,4);

\draw (0,0) .. controls (0,4) and (4,0) .. (4,4);

\draw[red,ultra thick] (2,2) circle (3cm);

\draw (2,2) ellipse (3cm and 1cm);

\draw (3,0) circle (3cm);
\draw (3,0) arc (0:75:3cm);

\draw[step=1cm,gray,very thin] (-1.9,-1.9) grid (5.9,5.9);

\filldraw[red] (2,2) circle (3cm);

\shadedraw[inner color=blue,outer color=red, draw=black] (0,0) rectangle (4,4);

\draw[thick,->] (-4.5,0) -- (4.5,0) node[anchor=north west] {$x$ axis};
\draw[thick,->] (0,0) -- (0,4.5) node[anchor=south east] {$y$ axis};

\foreach \x in {0,1,2,3,4}
    \draw (\x cm,1pt) -- (\x cm,-1pt) node[anchor=north] {$\x$};
\foreach \y in {0,1,2,3,4}
    \draw (1pt,\y cm) -- (-1pt,\y cm) node[anchor=west] {$\y$};

\end{tikzpicture}
\\
\lipsum[2]
\\
\\
\begin{tikzpicture}
\draw (0,0) .. controls (0,4) and (4,0) .. (4,4);
\draw[red] (3,0) arc (0:75:3cm);
\draw[step=1cm,gray,very thin] (-.9,-.9) grid (2.9,2.9);
\end{tikzpicture}

\end{document}