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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));
        }
}
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