Hello Uttam,
A Pie chart is generally 100%, as explained here:
http://www.telerik.com/help/aspnet-ajax/htmlchart-types-pie-chart.html.
You can add a title for the chart or a regular span/ASP label around the chart to indicate that it shows 100%
You can also create two items for it - one with the Used value you have and another with value equal to 100-Used, so that they show up in the legend as desired. This will allow you to set their colors and names as well. For example
which results in the attached image.
On paddings - you can wrap the chart in another div and set its properties as desired to offset the chart from the adjacent elements.
Regards,
Marin Bratanov
the Telerik team
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