Math & Science ⇒ theorem / proof alignment

[abu aasiyah]

Hello all,

I have a theorem inside a grey box and beneath this I have the prrof. The thing is that I am tryin to align the theorem and the proof. Can someone assist me in this.

The code is:

Code: Select all

Code, edit and compile here:

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\documentclass[12pt,a4paper]{article} 
\usepackage[latin1]{inputenc} 
\usepackage[danish]{babel} % danske overskrifter
\usepackage[T1]{fontenc} 
\usepackage{lmodern} 
\usepackage{graphicx} 
\usepackage{mathtools}
\usepackage{amsmath}
\usepackage{amsfonts}
\usepackage{ulem}
\usepackage{textcomp}
\usepackage{tikz}
\usepackage{color}
\usepackage{arcs}
\usepackage{amsthm}
\newtheorem{startthe}{Sætning}
\newtheorem{defn}{Definition}
\makeatletter
\renewcommand{\paragraph}{\@startsection{paragraph}{4}{0ex}%
   {-3.25ex plus -1ex minus -0.2ex}%
   {1.5ex plus 0.2ex}%
   {\normalfont\normalsize\bfseries}}
\makeatother
\stepcounter{secnumdepth}
\stepcounter{tocdepth}
\begin{document}
\fcolorbox{black}{lightgray}{
\begin{minipage}{0.90\linewidth}
\begin{startthe}
\hspace{1cm}\newline
Idet $k_{n}$ betegner sidelængden i den omskrevne $n$-kant i enhedsvirklen, så gælder at:
\begin{equation*}
k_{2n}=\sqrt{2-\sqrt{4-k_{n}^{2}}}'
\end{equation*}
\end{startthe}
\end{minipage} 
 
 
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Run LaTeX here

[daleif]

There are some examples about how to do this in my Danish latex book, simply search my name and latexbog in google