arc.endAngle([angle])
If angle is specified, sets the end angle to the specified function or number and returns this arc generator. If angle is not specified, returns the current end angle accessor, which defaults to:
function endAngle(d) { return d.endAngle; }
The angle is specified in radians, with 0 at -y (12 o’clock) and positive angles proceeding clockwise. If |endAngle - startAngle| ≥ τ, a complete circle or annulus is generated rather than a sector.
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