UVA 10283 - The Kissing Circles, getting WA

[Md. Abdulla Al Mamun Nayon]

Problem link: http://uva.onlinejudge.org/index.php?option=com_onlinejudge&Itemid=8&category=24&page=show_problem&problem=1224

My concept in picture:


My Code:

#include <iostream>
#include <cstdio>
#include <cmath>
#define PI 2*acos(0.0)
#define EP 1e-6

using namespace std;

int main()
{
    int n;
    double R, r, c, t, t2, l, e, s;
    while(scanf("%lf %d", &R, &n) != EOF){
        if(R < EP){
            r = 0;
            l = 0;
            e = 0;
        }
        else if(n == 1){
            r = R;
            l = 0;
            e = 0;
        }
        else{
            t = 2*PI/n;
            c = R*sqrt(2 - 2*cos(t));
            r = c*R/(2*R+c);
            t2 = acos(r/(R-r));
            l = n*(sqrt(R*r*r*(R-(2*r))) - r*r*t2);
            e = PI*(R*R - n*r*r) - l;
        }
        printf("%.10lf %.10lf %.10lf\n", r, l, e);
    }
    return 0;
}

there is wrong answers after the decimal point, Is taking PI is correct?

[Md. Abdulla Al Mamun Nayon]

Finally I got Accepted, My fault was taking n as integer.