code: def get_tri_area(pts):
      
      a, b, c = pts[0], pts[1], pts[2]
      v1 = np.array(b) - np.array(a)
      v2 = np.array(c) - np.array(a)
      area_tri = abs(sp.linalg.norm(sp.cross(v1, v2)) / 2)
      return area_tri
docs: Given a list of coords for 3 points,
      Compute the area of this triangle.
  
      Args:
          pts: [a, b, c] three points