Selena's family went on a trip. The total hotel bill was $659 . The cost of the airfare was $633. use mental math to find the to
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The radius is the distance from the center to any point. The distance from (2,1) to (0,1) is of course 2. The general formula for a circle with radius r and center (a,b) is
In our case we get
In our case we get