code: def _areas_of_triangles(a, bs, c):
      bs_minus_a = bs - a
      a_minus_bs = a - bs
      return 0.5 * abs(
          (a[0] - c[0]) * (bs_minus_a[:, 1])
          - (a_minus_bs[:, 0]) * (c[1] - a[1])
      )
  
label_desc: Use image node_id 1 for calling a global function with example usage: _areas_of_triangles(a, bs, c) and returns: unknown