diff --git a/mr/UB3/mr3.pdf b/mr/UB3/mr3.pdf
index b70f701..c2066d9 100644
--- a/mr/UB3/mr3.pdf
+++ b/mr/UB3/mr3.pdf
Binary files differ
diff --git a/mr/UB3/mr3.tex b/mr/UB3/mr3.tex
index 36172e5..dea831b 100644
--- a/mr/UB3/mr3.tex
+++ b/mr/UB3/mr3.tex
@@ -216,8 +216,17 @@
 	\end{enumerate}
 
 	\Aufgabe{}{8}
+	\begin{enumerate}[(a)]
+	\item $ r= \frac{l}{2\tan^{-1}(\varPsi)}$
+	\item todo 	
+	\item $ l_1 = r\tan^{-1}(\varPsi_1)\\
+	l_2 = r\tan^{-1}(\varPsi_2)\\
+	$
+\item $r = \frac{l\sin(\Psi_2-\frac{\pi}{2})\sin(\Psi_1-\frac{\pi}{2})}{\Psi_1+\Psi_2}$ 
 
-    
+	\end{enumerate}
+	Die war zu einfach ... da ist irgendwas falsch...    
+