Circle Drawing radius

[AndresNebel]

Hello everyone,

I wrote some code to make something similar to this example:
http://projectserver.dataplus.ru/arcgis_js_api/sdk/jssamples/graphics_add.html

I need to display the radio in km of a drawn circle when draw ends, but the geometry doesn't have an attribute or something that i could use. May be this is a trivial thing to do, but i'm a beginner ArcGIS Javascript API.

Hope someone can help

Regards
Andres