Triangle.java

public class Triangle {
    
    double edgeA;
    double edgeB;
    double edgeC;
    
    double getArea(){
        double halfPerimeter=getPerimeter()/2;
        return (halfPerimeter-edgeA)*(halfPerimeter-edgeB)*(halfPerimeter-edgeC);
    }
    double getPerimeter(){
        return edgeA+edgeB+edgeC;
    }
}