Let us consider a circle with radius 
. If we draw an angle 
(in radians) from the center of the circle, the two radii forming that angle intersect the circle at A and B. We call 
the area delimited by the chord and the arc 
(the so-called Circular Segment, blu in the figure).
. If we draw an angle (in radians) from the center of the circle, the two radii forming that angle intersect the circle at A and B. We call the area delimited by the chord and the arc (the so-called Circular Segment, blu in the figure). 
For a given radius r and area a, compute the angle t (rounded to 6 significant digits).
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nice problem :)
Beautiful problem.