Drawing circles on map using OpenLayers 3?

I want to draw circles of certain radius on a map using openlayers . But the latitude,longitude & radius values are given in a excel sheet.

How do I do this work in OpenLayers?

I heard that OpenLayers doesn't take data from excel sheet so to which format I have to change my excel file?

And how to draw circles on the map?

Answer

Circles in Openlayers

http://geographika.co.uk/samples/geodesic/

http://geographika.co.uk/creating-a-geodesic-circle-in-openlayers you will need your data in json - Google Spreadsheets can do this

http://spreadsheets.google.com/feeds/feed/key/worksheet/public/basic?alt=json-in-script&callback=myFunc

http://code.google.com/apis/gdata/samples/spreadsheet_sample.html