interface shape{
    area():number;
    volume():number;
}
class triangle implements shape
{
    l: number;
    b: number;
    h: number;
    area() {
        return this.l * this.b * this.h;
    }
    volume() {
        return 0.5 * this.b * this.h;
    }
}
class cube implements shape{
    a: number;
    area() {
        return 6 * this.a * this.a;
    }
    volume() {
        return this.a * this.a * this.a;
    }
}
var s = new triangle();
s.l = 10;
s.b = 20;
s.h = 15;
var c = new cube();
c.a = 5;
console.log("Area of Triangle:" + s.area());
console.log("Volume of Triangle:" + s.volume());
console.log("Area of cube:" + c.area());
console.log("Volume of cube:" + c.volume());