Highlights
Introductions
The formula to calculate the area of a circumference is defined as A = π . R2. Considering to this problem that π = 3.14159:
Calculate the area using the formula given in the problem description.
Input
The input contains a value of floating-point (double precision), that is the variable R.
Output
Present the message "A=" followed by the value of the variable, as in the example below. Like all the problems, don't forget to print the end of the line after the result, otherwise, you will receive "Presentation Error".
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