22863: Overlapping cells
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Description
Today, Subaba is doing experiments ,he is observing overlap of two cells. Now ,your task is to find out these the situation of two cells touching the nutrient solution.
To simplify the question, we take a cell as a circle.
Input
Input one row ,in which has 6 floating-point numbers, x1, y1, r1, x2, y2, r2 ( -1000000<=x1, y1, r1, x2, y2, r2<=1000000 )，indicate the coordinate of circle center and radius of cell separately.
Output
The answer accurate to 2 decimal.
Sample Input Copy
-1 0 2 1 0 2
-2 0 2 2 0 2
1 1 1 1 1 1
Sample Output Copy
16.76
25.13
6.28
HINT
Π = 3.1415926535898