URI 1002

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Solution of URI 1002 >>Area of Circle

  1. #include < stdio.h >
  2. int main()
  3. {
  4.     double R, A, pi ;
  5.     pi = 3.14159;
  6.     scanf ("%lf",  & R);
  7.     A = pi * R * R;
  8.     printf ("A=%.4lf\n", A );
  9.  
  10.     return 0;
  11. }

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