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  1. #include <stdio.h>
  2. #include <math.h>
  3.  
  4. int main(void){
  5.     int n;
  6.     double x;
  7.     scanf("%lf %d",&x,&n);
  8.     printf("%f\n",x*x*n/4/tan(M_PI/n));
  9.     return 0;
  10. }
  11.  
Success #stdin #stdout 0s 2252KB
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stdin
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1 4
stdout
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1.000000
https://ideone.com/s6eVQz
language:
C (gcc 8.3)
created:
9 years ago
visibility:
secret

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