input: Write a python function to create an instance of the RoundInstance class and verify its properties.
  ```python
  assert create_round_instance(3).get_radius() == 3
  assert create_round_instance(3).get_diameter() == 6
  assert create_round_instance(3).get_area() == 28.27
  assert create_round_instance(3).get_circumference() == 18.85
  assert create_round_instance(5).get_radius() == 5
  assert create_round_instance(5).get_diameter() == 10
  assert create_round_instance(5).get_area() == 78.54
  assert create_round_instance(5).get_circumference() == 31.42
output: import math
  
  class RoundInstance:
      def __init__(self, radius):
          self.radius = radius
  
      def get_radius(self):
          return self.radius
  
      def get_diameter(self):
          return self.radius * 2
  
      def get_area(self):
          return round(math.pi * self.radius**2, 2)
  
      def get_circumference(self):
          return round(2 * math.pi * self.radius, 2)
  
  def create_round_instance(radius):
      return RoundInstance(radius)