[XeTeX] smaller font formule with xelatex

[André de Boer]

Hello all,

I have to make a text in Verdana. Therefor i use xelatex.
This is part of my preamble:

    \documentclass[10pt]{article}
    \usepackage{amsmath}
    \usepackage{amsfonts}
    \usepackage{amssymb}
    \usepackage[cm-default]{fontspec}
    \setmainfont{Verdana}
    \setmathrm{Verdana}

Now are the formules smaller than the text.
How can i overcome this. I use XP with miktex.

Thanks for the answer,
André