[Tex/LaTex] Change Paper Size in Tufte Book Class

Question

Is there a (relatively) easy way to change the paper size in the tufte-book class? The manual for Tufte 3.50 by Kevin Godby (http://kevin.godby.org/2009/12/11/tufte-latex-350-released/) says,

"To specify a different paper size (and/or margins) use the \geometrysetup command in the preamble of your document (or one of the file hooks). The full documentation of the \geometrysetup command can be found in the geometry package documentation."

The 2008 version of the documentation, by Hideo Umeki, is referenced. This version has been superseded by the 2010 geometry package documentation, which contains no mention of the \geometrysetup command (at least, "find \geometrysetup" and "find setup" turned up nothing, while searches for other commands yielded results).

So how can the page size be changed using the tufte book class?

To add a MWE, the papersize remains the default 8.5×11.5 despite the addition of the geometry package and the \geometry command.

\documentclass{tufte-book}
\usepackage{lipsum}
\usepackage{geometry}

 \geometry{height=9in,width=6in}

\newenvironment{loggentry}[2]% date, heading
{\noindent\textbf{#2}\marginnote{#1}\\}{\vspace{0.5cm}}

\begin{document}


\begin{loggentry}{2009-Oct-31}{Snow}
\lipsum[1]
\end{loggentry}

\begin{loggentry}{2010-Dez-31}{Water of Life}
\lipsum[2]

\end{document}

The answer was provided in the comments but I don't know how to mark it as correct. Thank you everyone.

Answer 1

Options width and height of \geometry set the width and height of the text body (\textwidth and \textheight). Options paperwidth and paperheight sets the paper or media size, e.g.:

Most of the following settings are scaled values according to the settings for B5 in tufte-common.def. The margin par area is made smaller to follow the width of the dates.

\documentclass{tufte-book}
\usepackage{lipsum}

\usepackage{geometry}

\makeatletter
% Patch to ignore warnings
\Gm@hbodyfalse
\Gm@vbodyfalse
\makeatother

\geometry{
  % showframe,
  paperwidth=6in,
  paperheight=9in,
  left=0.55in,
  right=0.45in,
  top=.5in,
  bottom=.5in,
  marginparsep=0.25in,
  marginparwidth=0.65in,
  includemp,
  includehead,
  % The text width and height are calculated automatically.
}

\newenvironment{loggentry}[2]% date, heading
{\noindent\textbf{#2}\marginnote{#1}\\}{\vspace{0.5cm}}

\begin{document}
\begin{loggentry}{2009-Oct-31}{Snow}
\lipsum[1]
\end{loggentry}

\begin{loggentry}{2010-Dez-31}{Water of Life}
\lipsum[2]
\end{loggentry}
\end{document}

For layout experiments, option showframe for geometry is useful: