\documentclass[a4paper,11pt]{article}
\usepackage[polish]{babel}
\usepackage[utf8]{inputenc} 
\usepackage[T1]{fontenc}
\usepackage{fourier}
\usepackage{graphicx}
\usepackage{geometry}
\usepackage{subfig}

\geometry{width=126mm}

\begin{document}

\begin{figure}[!htb]
\centering
\begin{tabular}{cc}
\subfloat[]
{\includegraphics{bezier1.pdf} \label{fig:tab:bezier1}}&
\subfloat[]
{\includegraphics{bezier2.pdf} \label{fig:tab:bezier2}}\\
\subfloat[]
{\includegraphics{bezier3.pdf} \label{fig:tab:bezier3}}&
\subfloat[]
{\includegraphics{bezier4.pdf} \label{fig:tab:bezier4}}\\
\end{tabular}
\caption{Krzywe B\'eziera}
\label{fig:krzywe:beziera}
\end{figure}

\end{document}