Perimeter of Circle solution in c plusplus

//Perimeter of Circle  2 × pi × radius
#include<iostream>
#include<conio.h>
using namespace std;
int main()
{
double Circle,pi=3.1415926535,radius;
cout<<"Enter Radius = ";
cin>>radius;
Circle=2*pi*radius;
cout<<"Perimeter of Triangle = "<<Circle;
getch();
}

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