diff --git a/zajecia 3/ragdoll.pdf b/zajecia 3/ragdoll.pdf
deleted file mode 100644
index 40cb8bd..0000000
Binary files a/zajecia 3/ragdoll.pdf and /dev/null differ
diff --git a/zajecia 4/zadania03.txt b/zajecia 4/zadania03.txt
new file mode 100644
index 0000000..9eac552
--- /dev/null
+++ b/zajecia 4/zadania03.txt	
@@ -0,0 +1,15 @@
+#+TITLE: Pakiety matematyczne: amsmath, amsthm, mathtools − prezentacja możliwości
+
+* Prezentacja podczas zajęć
+W czasie prezentacji należy omówić:
+ + pakiet amsmath − wyrównywania wzorów wystawionych, wielopoziomowe
+   indeksy np. w sumach, komenda \operatorname
+ + pakiet amsthm − sposoby ddefiniowania nowych środowisk typu
+   twierdzenie, definicja; opcjonalny argument środowiska; polecenie
+   \theoremstyle
+ + pakiet mathtools − komenda \smashoperator; otoczenie typu matrix i
+   pochodne; komenda \DeclarePairedDelimiter; komenda showonlyrefs
+
+* Zadanie do wykonania podczas zajęć
+ + Przetestować omówione podczas prezentacji możliwości pakietów na
+   przykładzie pliku zajecia03-plik.tex
diff --git a/zajecia 4/zajecia03-plik.aux b/zajecia 4/zajecia03-plik.aux
new file mode 100644
index 0000000..f23e546
--- /dev/null
+++ b/zajecia 4/zajecia03-plik.aux	
@@ -0,0 +1 @@
+\relax 
diff --git a/zajecia 4/zajecia03-plik.log b/zajecia 4/zajecia03-plik.log
new file mode 100644
index 0000000..a1a6adb
--- /dev/null
+++ b/zajecia 4/zajecia03-plik.log	
@@ -0,0 +1,531 @@
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diff --git a/zajecia 4/zajecia03-plik.pdf b/zajecia 4/zajecia03-plik.pdf
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diff --git a/zajecia 4/zajecia03-plik.synctex.gz b/zajecia 4/zajecia03-plik.synctex.gz
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diff --git a/zajęcia 5/main.tex b/zajęcia 5/main.tex
new file mode 100644
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+++ b/zajęcia 5/main.tex	
@@ -0,0 +1,80 @@
+\documentclass{beamer}
+\usepackage{polski}
+\usepackage[utf8x]{inputenc}
+\usepackage[T1]{fontenc}
+\usepackage{amsmath}
+\usepackage{graphicx}
+\usepackage{tikz}
+\title{Dowód twierdzenia Pitagorasa}
+
+\author{Andrzej Kokosza}
+
+\begin{document}
+
+\begin{frame}
+  \titlepage
+\end{frame}
+\begin{frame}
+\begin{center}
+\begin{tikzpicture}
+\draw [help lines] (0,0) grid(7,7);
+\draw [fill=blue!50,  opacity=0.5] (0,3) -- (0,0) -- (4,0);
+\draw [fill=green!50,  opacity=0.5] (4,0) -- (7,0) -- (7,4);
+\draw [fill=red!50,  opacity=0.5] (7,4) -- (7,7) -- (3,7);
+\draw [fill=yellow!50,  opacity=0.5] (3,7) -- (0,7) -- (0,3);
+\draw [thick] (0,3) -- (4,0) -- (7,4) -- (3,7) -- (0,3);
+\node at (2,-0.2) {a}; \node at (5.5,-0.2) {b}; \node at (7.2,2) {a}; \node at (7.2,5.5) {b};
+\node at (1.5,7.2) {b}; \node at (5.,7.2) {a}; \node at (-0.2,1.5) {b}; \node at (-0.2,5) {a};
+\node at (1.85, 1.85) {c}; \node at (5.15, 1.85) {c}; \node at (5.15,5.15) {c}; \node at (1.85, 5.15) {c};
+\node at (3.5,3.5) {$c^2$};
+\end{tikzpicture}
+\end{center}
+\end{frame}
+
+\begin{frame}
+\begin{center}
+\begin{tikzpicture}
+\draw [help lines] (0,0) grid(7,7);
+\draw [fill=blue!50,  opacity=0.5] (0,3) -- (0,0) -- (4,0);
+\draw [fill=green!50,  opacity=0.5] (0,3) -- (4,3) -- (4,0);
+\draw [fill=red!50,  opacity=0.5] (7,3) -- (7,7) -- (4,7);
+\draw [fill=yellow!50,  opacity=0.5]  (7,3) -- (4,3) -- (4,7);
+\node at (2,-0.2) {a}; \node at (-0.2,1.5) {b}; 
+\node at (5.5,7.2) {b}; \node at (7.2,5) {a}; 
+\node at (1.85, 1.85) {c};  \node at (5.15,5.15) {c};
+\draw [thick] (0,3) rectangle (4,7);
+\draw [thick] (4,0) rectangle (7,3);
+\node at (2,5) {$a^2$};  \node at (5.5,1.5) {$b^2$};
+\end{tikzpicture}
+\end{center}
+\end{frame}
+
+\begin{frame}
+\begin{center}
+\begin{tikzpicture}
+\draw [help lines] (0,0) grid(7,7);
+\draw [fill=blue!50,  opacity=0.7] (0,3) -- (0,0) -- (4,0);
+\draw [fill=green!50,  opacity=0.7] (4,0) -- (7,0) -- (7,4);
+\draw [fill=red!50,  opacity=0.7] (7,4) -- (7,7) -- (3,7);
+\draw [fill=yellow!50,  opacity=0.7] (3,7) -- (0,7) -- (0,3);
+\draw [help lines] (0,0) grid(7,7);
+\draw [fill=blue!50,  opacity=0.7] (0,3) -- (0,0) -- (4,0);
+\draw [fill=green!50,  opacity=0.7] (0,3) -- (4,3) -- (4,0);
+\draw [fill=red!50,  opacity=0.7] (7,3) -- (7,7) -- (4,7);
+\draw [fill=yellow!50,  opacity=0.7]  (7,3) -- (4,3) -- (4,7);
+\draw [thick] (0,3) rectangle (4,7);
+\draw [thick] (4,0) rectangle (7,3);
+\draw [thick] (0,3) -- (4,0) -- (7,4) -- (3,7) -- (0,3);
+\end{tikzpicture}
+\end{center}
+\end{frame}
+
+\begin{frame}
+\begin{center}
+\begin{tikzpicture}
+Oba kwadraty mają to samo pole powierzchni. Zauważmy, że kolorowe trójkąty w obu kwadratach mają tą samo pole powierzchni. Zatem pole białych kwadratów jest takie samo w obu, czyli
+$$a^2+b^2=c^2$$
+\end{tikzpicture}
+\end{center}
+\end{frame}
+\end{document}
\ No newline at end of file