This is how it looks in my app
<telerik:PieSeriesDefinition AxisName="YourName"
ShowItemLabels="True"
ItemLabelFormat="#%{P0}"
RadiusFactor="0.7">
The key here is the ItemLabelFormat
with RadiusFactor
you can move it as far as you want from the center
Forgot to add this to the answer as well. Inside ChartDefaultView.ChartArea
add this
<telerik:ChartArea.AxisY>
<telerik:AxisY AxisName="YourName" DefaultLabelFormat="#VAL{p}"/>
</telerik:ChartArea.AxisY>