input: Write a python function to create a Circle2D object and calculate its area.
  assert Circle2D(0, 0, 5).get_area() == 78.5
  assert Circle2D(1, 1, 10).get_area() == 314.0
  assert Circle2D(-5, -5, 3).get_area() == 28.26
output: import math
  
  class Circle2D:
      def __init__(self, x, y, radius):
          self.x = x
          self.y = y
          self.radius = radius
      
      def get_area(self):
          return round(math.pi * self.radius ** 2, 2)