#include <iostream>
#include <cmath>

using namespace std;

void computeTriangle(float &a, float &p, float x, float y, float z);

int main(){
  float a,p,x,y,z;
  cout<<"Enter the sides: "<<endl;
  cin>>x>>y>>z;
  computeTriangle(a,p,x,y,z);
  cout<<"The perimeter of the triangle is : "<<p<<" and its area is: "<<a<<endl;
}

void computeTriangle(float &a, float &p, float x, float y, float z){

  p = x + y +z;
  float s = p/2.;
  a = sqrt(s*(s-x)+s*(s-y)+s*(s-z));
  
}