Is This Integration
#include <iostream>
#include <cmath>
#define pi 3.141592653589793
using namespace std;
int main(){
double a;
while(cin >> a){
double x, y, z;
double triangle = a * a * sin(pi / 3.0) / 2;
double sector = pi * a * a * (1 / 6.0);
double sector4 = pi * a * a * 0.25;
x = a * a - triangle - sector;
z = (4 * sector4 - 3 * a * a + x * 4);
y = (a * a - 4 * x - z) / 4.0;
printf("%.3f %.3f %.3f\n", z, y * 4, x * 4);
}
return 0;
}