Given two points on an arc (x0,y0) and (x1,y1) and the angle between them, alpha.
Return the centre of the circle and the radius.
E.g. Start (1,0) End (0,1) Span 90
The centre is (0,0) and the radius is 1.
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This problem does not have an unique solution. Unless the angle between two points on an arc is 180 degrees, there is always two possible positions for the center. The problem should specifiy which is the right one, or accept both answers. I solved it using the center with the smallest distance to the origin.
The test suite has been updated to accept any of the two possible solutions.
The test suite does not use the values returned by the function.