#include "iostream"
#include "cmath"

using namespace std;

class Figure{
protected:
    string TypeFigure;
public:
    Figure(){}
    virtual ~Figure() {}
    string GetTypeFigure() { return TypeFigure; }
    virtual double Area() = 0;
};


class Triangle : public Figure{
    double AB, BC, AC;
public:
    Triangle(){}
    Triangle(double AB, double BC, double AC){
        this->AB = AB;
        this->BC = BC;
        this->AC = AC;
        TypeFigure = "Triangle";
    };
    double Area(){
        double p = (AB+BC+AC)/2;
        return sqrt(p*(p-AB)*(p-BC)*(p-AC));
    }
};

class Rectangle : public Figure{
    double AB, BC;
public:
    Rectangle(){}
    Rectangle(double AB, double BC){
        this->AB = AB;
        this->BC = BC;
        TypeFigure = "Rectangle";
    }
    double Area(){
        return AB*BC;
    }
};

class Circle : public Figure{
    double R;
public:
    Circle(){}
    Circle(double R){
        this->R = R;
        TypeFigure = "Circle";
    }
    double Area(){
        return 3.14*R*R;
    }
};

int main(){
    string Type;
    cin >> Type;
    Figure *temp;
    if (Type == "Triangle"){
        double AB, BC, AC;
        cin >> AB >> BC >> AC;
        temp = new Triangle(AB,BC,AC);
        cout << "Area " << temp->GetTypeFigure() <<  " = "<< temp->Area();
    }
    else if (Type == "Rectangle"){
        double AB, BC;
        cin >> AB >> BC;
        temp = new Rectangle(AB, BC);
        cout << "Area " << temp->GetTypeFigure() <<  " = "<< temp->Area();
    }
    else if (Type == "Circle"){
        double R;
        cin >> R;
        temp = new Circle(R);
        cout << "Area " << temp->GetTypeFigure() <<  " = "<< temp->Area();
    }
    else{
        cout << "Input error" << endl;
        return 0;
    }
    delete temp;
    return 0;
}