SOLUTION: the locus of all pointsd in a plane that are one unit from a circle of radius 3 units is what?

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Question 612440: the locus of all pointsd in a plane that are one unit from a circle of radius 3 units is what?
Answer by Edwin McCravy(20056) About Me  (Show Source):
You can put this solution on YOUR website!
Suppose this green circle is of radius 3 units:
drawing%28200%2C200%2C-4%2C4%2C-4%2C4%2C+green%28circle%280%2C0%2C3%29%29+%29
Then the locus of all points which are 1 unit distance 
(radially) from each point on that green circle are these 
two red circles, one inside of radius 2 units and one 
outside of radius 4 units.


Edwin