code: def bounding_box(self):
          
          xmin = self.center.x - self.radius
          xmax = self.center.x + self.radius
          ymin = self.center.y - self.radius
          ymax = self.center.y + self.radius
  
          return BoundingBox.from_float(xmin, xmax, ymin, ymax)
docs: Bounding box (`~regions.BoundingBox`).