You can change value 20 before starting animation

Output

Variable Name      Object in Memory
radius
area
1256.636
  1  # Assign a radius
  2  radius = ; # radius is now 20
  3  
  4  # Compute area
  5  area = radius * radius * 3.14159
  6  
  7  # Display results
  8  print("The area for the circle of radius", radius, "is", area)


      
An animated program with explanatory texts about specified elements.