Failed Downcast in Class Hierarchy

#include <iostream>

class Shape {
public:
    virtual ~Shape() {}
};

class Circle : public Shape {
public:
    double radius;
    Circle(double r) : radius(r) {}
    double area() { return 3.14 * radius * radius; }
};

void processShapeHierarchy(Shape* shape) {
    Circle* circle = dynamic_cast<Circle*>(shape);
    if (circle!= nullptr) {
        std::cout << "Area: " << circle->area() << std::endl;
    }
}

int main() {
    Shape* shape = new Circle(5);
    processShapeHierarchy(shape);
    delete shape;
    return 0;
}