#include <iostream>

#include<math.h>

using namespace std;

double A1,A2,A3,A4,A5,a,OC1,OC5,x1,x2,x3,x4,x5,yy1,y2,y3,y4,y5,Xz,Xy,Xt,Xm,Xn,Yz,Yy,Yt,Ym,Yn,Xxc,Yyc,r1,alfa,Aadun,Xc,Yc,Xadun,Yadun;

int main()

{cout<<"Introduceti valoarea lui a"<<endl;

cin>>a;r1=3*a;

A1=M_PI*pow(r1,2)/4;

alfa=sin(M_PI/4)*4/M_PI;

OC1=2*a*alfa;

x1=-OC1*cos(M_PI/4);

yy1=-OC1*sin(M_PI/4);

A2=9*pow(a,2)/4;

x2=a/2;

y2=a;

A3=9*pow(a,2)/2;

x3=a;

y3=a;

A4=M_PI*pow(a,2)/2;

x4=0;

y4=4*a/(3*M_PI);

A5=M_PI*pow(a,2)/4;

OC5=0.666666*a*alfa;

x5=-OC5*cos(M_PI/4);

y5=-OC5*sin(M_PI/4);

Xz=x1*A1;

Xy=x2*A2;

Xt=x3*A3;

Xm=x4*A4;

Xn=x5*A5;

Aadun=A1+A2+A3-A4-A5;

Xadun=Xz+Xy+Xt+Xm+Xn;

Xxc=Xadun/Aadun;

Yz=yy1*A1;

Yy=y2*A2;

Yt=y3*A3;

Ym=y4*A4;

Yn=y5*A5;

Yadun=Yz+Yy-Ym-Yn;

Yyc=Yadun/Aadun;

cout<<"\nx centru de greutate este:"<<Xc<<endl;

cout<<"y centru de greutate este:"<<Yc;

return 0;

}