The "l.setAngles(angles);" and the "angles" variable are not necessary. Removing them should solve the problem.
means the angularAxis will have 5 labels, and their angular coordinates are their array index 0, 1, 2, 3, 4, which distributed evenly along the circle. The angularAxis does not automatically use degrees as the unit. If you want the angular coordinates to be from 0 to 360, you would need to use c.angularAxis().setLinearScale2(0, 360, labels);.
Also, for the PolarLayer, if you do not provide the angular coordinates, it will be the array index of the data (0, 1, 2, 3, 4, 5) as the coordinates. That means the labels and data will automatically match.
The above behaviour is the same for XYCharts too. If no x-coordinates are provided, the array index is the x-coordinate, so multiple arrays will automatically match each others.