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based on an earlier version of the Wolfram Language.
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PieOrientation

PieOrientation
is an option for PieChart that determines the placement of the first piece of data.
  • PieOrientation-> starts the pie chart along the angle . =0 corresponds to the positive x axis, and increases in a counterclockwise direction.
  • PieOrientation->dir fills the pie chart in the specified direction. dir can be either "Clockwise" or "CounterClockwise".
  • PieOrientation->{, dir} starts along the angle and proceeds in the direction dir.
  • PieOrientation->Automatic is the same as PieOrientation->{0, "CounterClockwise"}.