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为何呀RE???#include <stdio.h>
#include <math.h>
#define Pi 3.14159265358979323846
int main()
{
int i=0,j=0,n,m;
double R,r[1000];
scanf("%d",&m);
for(i=0;i<m;i++)
{
scanf("%lf %d",&R,&n);
r[i]=R*sin(Pi/(1.0*n))/(1.0+sin(Pi/(1.0*n)));
}
for(i=0;i<m;i++)
{
printf("Scenario #%d\n%.3lf\n\n",i+1,r[i]);
}
return 0;
}
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