replace this
#update End_Angle
End_Angle = Start_Angle + i.SweepAngle
by this
#update End_Angle
End_Angle = i.StartAngle + i.SweepAngle
replace this
#update End_Angle
End_Angle = Start_Angle + i.SweepAngle
by this
#update End_Angle
End_Angle = i.StartAngle + i.SweepAngle