input: Write a function to compute the area of a circle given the radius as input. If the radius is 0 or negative, return 0. The function should use the math module to compute the area.
  assert area_circle(5) == 78.54
  assert area_circle(0) == 0
  assert area_circle(-3) == 0
  assert area_circle(10) == 314.16
  assert area_circle(7) == 153.94
output: import math
  
  def area_circle(radius):
      if radius <= 0:
          return 0
      return round(math.pi * radius ** 2, 2)