circle_list
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initialAngle
initialAngle default is 90°. how to make it begin at 0°. if children length = 30;
try to make the initial angle 0°,but if children length is not divisible by 180,you may need to calculate it manually😄
setting initialAngle to -pi/2 sets the start angle so that the first child is oriented to the top
initialAngle: -pi/2,