import java.util.*;

class Areas {
	int areaR(int l, int w){
		return (l*w);
	}
	double areaT(float b, float h){
		return(0.5*b*h);
	}
	double areaC(float r){
		return(3.14*r*r);
	}
}

class Area {
	public static void main(String args[]) {
		Areas a = new Areas();
		Scanner sc = new Scanner(System.in);
		System.out.println("Enter Length and Width of Rectangle");
		int l = sc.nextInt(), w = sc.nextInt();
		System.out.println("Enter Base and Height of Triangle");
		float b = sc.nextFloat(), h = sc.nextFloat();
		System.out.println("Enter Radius of Circle");
		float r = sc.nextFloat();
		System.out.println("Area of Rectangle: "+ a.areaR(l,w));
		System.out.println("Area of Triangle: "+ a.areaT(b,h));
		System.out.println("Area of Circle: "+ a.areaC(r));
	}
}