CarpetQuote.java

public class CarpetQuote {
    public double calculate(Shape shape,
                            double pricePerSqM,
                            double width,
                            double length,
                            double radius,
                            double side,
                            double a,
                            double b,
                            double height) {
        
        double area = 0.0;

        switch(shape){
            case Rectangle:
                area = width * length;
                break;
            case Circle:
                area = Math.PI * radius * radius;
                break;
            case EquilateralTriangle:
                area = (Math.sqrt(3)/4) * side * side;
                break;
            case Trapezium:
                area = ((a + b) / 2) * height;
                break;
        }

        return Math.ceil(area * pricePerSqM);
    }
}