You may write it like this:
<PathGeometry x:Key="Chevrons">
<PathGeometry.Transform>
<TranslateTransform X="20" Y="120"/>
</PathGeometry.Transform>
<PathGeometry.Figures>
M21.750001,94.749999 L34.000002,117.66218 30.625003,133.62501 ...
</PathGeometry.Figures>
</PathGeometry>
or like this:
<PathGeometry x:Key="Chevrons"
Figures="M21.750001,94.749999 L34.000002,117.66218 30.625003,133.62501 ...">
<PathGeometry.Transform>
<TranslateTransform X="20" Y="120"/>
</PathGeometry.Transform>
</PathGeometry>