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Question 243

Circle Area from Input

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Circle Area from Input

Read a circle's radius (a decimal number) from standard input and print its area rounded to two decimal places. Use the formula area = 3.14159 * r * r with the value 3.14159 for PI. For example, if the input is 2, print:

12.57

Use printf with %.2f and no trailing newline.

Expected Output:

12.57
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2\n
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