Help me in solving LCPPCL30 problem

help
,
1

My issue

Area declare

My code

#include <iostream>
using namespace std;

int main() {

    double pi = 3.14;
     double radius=8.9;
    
    // declare radius and area as double
    
    area=pi*radius;
    
    cout << "The Area of the given Circle is " << area << endl;

}

Learning course: ATT - C++
Problem Link: Double datatype Practice Problem in ATT - C++ - CodeChef