code: def _get_thetas(num_vars):
      thetas = np.linspace(0, 2 * np.pi, num_vars, endpoint=False)
      # rotate theta such that the first axis is at the top
      thetas += np.pi / 2
      return thetas
  
imports: from chartify._core.colors import Color
  from chartify._core.chart import Chart
  from chartify._core.style import Style
  from chartify._core.axes import BaseAxes
  from chartify._core.plot import BasePlot
  from chartify._core.callout import Callout
  from chartify._core.options import options
  import numpy
  import pandas
label_desc: Use image node_id 1 for calling the PlotRadar obj's underlying member method code with example usage: obj._get_thetas(num_vars) and returns: thetas