Angle of the first point

This angle (A) determines the angular position of the first point on the first parallel, in the XY plan.

This value can be negative.

It's included between-360 ° and 360 °.

The value 0 ° corresponds to a point with a X coordinate X = 0 in the selected frame.

The value 90 ° corresponds to a point with a Y  coordinate  Y = 0 in the selected frame.

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