size11.clo
defines the font sizes in your case and report.cls
specifies how they are used in the document. Starting in report.cls
and considering the definition of chapters, we find the following:
\def\@makechapterhead#1{%
\vspace*{50\p@}%
{\parindent \z@ \raggedright \normalfont
\ifnum \c@secnumdepth >\m@ne
\huge\bfseries \@chapapp\space \thechapter
\par\nobreak
\vskip 20\p@
\fi
\interlinepenalty\@M
\Huge \bfseries #1\par\nobreak
\vskip 40\p@
}}
and:
\def\@makeschapterhead#1{%
\vspace*{50\p@}%
{\parindent \z@ \raggedright
\normalfont
\interlinepenalty\@M
\Huge \bfseries #1\par\nobreak
\vskip 40\p@
}}
These definitions show that \huge
is being used for the chapter name and number, while \Huge
is used for the chapter title.
Turning to size11.clo
, we find:
\newcommand\huge{\@setfontsize\huge\@xxpt{25}}
\newcommand\Huge{\@setfontsize\Huge\@xxvpt{30}}
Finally, in latex.ltx
, we have:
\def\@xxpt{20.74}
\def\@xxvpt{24.88}
So we can see that the chapter name and number will be set in size 20.74 and the title will be set in size 24.88. Note that this file also shows us that 11pt uses size 10.95, whereas 10pt and 12pt use 10 and 12 respectively:
\def\@xpt{10}
\def\@xipt{10.95}
\def\@xiipt{12}
size11.clo
defines the font sizes in that case andreport.cls
specifies how they are used in the document. Note that you can edit your question to add information by clicking on the 'edit' link at its bottom left.