[Tex/LaTex] Why does \typearea affect page/paper size

koma-scriptpaper-size

I'd like to use the \typearea package in order to properly calculate the size of the text block. However, invoking the package sets the paper size at A4, and I want to use a smaller size. Here's a MWE, commenting out the \usepackage…{typearea} line results in the correct paper size. 

%!TEX TS-program = xelatex
%!TEX encoding = UTF-8 Unicode

\documentclass[12.5pt,headsepline]{book} 

\usepackage[paperheight=7in,paperwidth=4.25in]{geometry}
\usepackage[utf8]{inputenc}



\usepackage{fontspec,xltxtra,xunicode}
\defaultfontfeatures{Mapping=tex-text}
\setromanfont[Mapping=tex-text]{Georgia}
\setsansfont[Scale=MatchLowercase,Mapping=tex-text]{Gill Sans}
\setmonofont[Scale=MatchLowercase]{Andale Mono}


\usepackage[fontsize=12.5]{scrextend}
\usepackage[Conny]{fncychap}

\usepackage{scrextend}

%\usepackage[BCOR=10mm,DIV=calc,pagesize]{typearea}

\usepackage{anyfontsize}


\title{Page Size Problem}
\date{}


\usepackage{kantlipsum}
\begin{document}
\mainmatter
\chapter{Chapter title}
\section{Section title}
\kant[1-15]
\end{document}

Best Answer

It is not possible to use both packages geometry and typearea to set the page layout.

Package typearea knows an option to set the paper size: paper=<width>:<height>. So you could use 

\usepackage[pagesize,paper=4.25in:7in,BCOR=10mm,DIV=calc]{typearea}

But note that your fontsize is to large for this small paper.

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