#### Topic: How to name the circles enclosed and described - parallel?

Hello! I do not know, likely nevertheless here correctly I write It is possible to construct two straight lines, parallel set, with identical offset. They will be parallel, and operation: "". It is possible to construct two circles which centers coincide with center of the given circle, and radiuses - accordingly it is more or less radius of the given circle on identical delta. How to name such circles, and how to name operation? Generally, by the way, it can be not circles, and any figures - squares, polygons, and .