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【简答题】
Create a class Circle2D which contains: ■ Two properties named X and Y of type double, that specify the center of the circle. ■ A property Radius of type double. ■ A no-arg constructor that creates a circle with (0 0) for (x y) and 1 for radius. ■ A read-only property Area that returns the area of the circle. ■ A read-only property Perimeter that returns the perimeter of the circle. ■ A method Contains(double x double y) that returns true if the specified point (x y) is inside this circle. ■ A method Contains(Circle2D circle) that returns true if the specified circle is inside this circle. ■ A method Overlaps(Circle2D circle) that returns true if the specified circle overlaps with this circle.
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