Calculate the solution

Steps

1. Understand the problem.
1. We need to output the report line announcing the calculation.
2. We need to show the input value, radius, and the resulting area.
   
2. Design a solution.
1. Output the literal value, "The area of a circle of radius ".
2. Output the value in radius.
3. Output the literal value, " is ".
4. Output the value in area.
5. Output the literal value, ".".
   
3. Test the solution.