Intro Java Areas with Scanner

import java.util.Scanner;

class Main {
  public static void main(String[] args) {
    /*
    can support decimal values: float and double
    integer types: byte short int long
    */

    //declaring variables
    Scanner scan;
    double areaOfCircle;
    int areaOfRect;

    int length, width, radius;
    final double PI=Math.PI;

    //inputs
    scan=new Scanner(System.in);
    length=15;
    width=24;
    radius=5;
    //prompt for length and width
    System.out.println("Please enter the length of the rectangle");
    //input using Scanner
    length=scan.nextInt();

    System.out.println("Please enter the width of the rectangle");
    //input using Scanner
    width=scan.nextInt();

    System.out.println("Please enter the radius of the circle");
    //input using Scanner
    radius=scan.nextInt();

    //calcs
    areaOfRect=length*width;
    areaOfCircle=radius*radius*PI;
    areaOfCircle=Math.pow(radius,2)*PI;

    //outputs
    System.out.println("Area of a rectangle with length: "+length+
                        " and a witdth: "+width+ " is: "+areaOfRect);
    System.out.println("Area of a circle with radius: "+radius+
                        " is: "+areaOfCircle);
  }
}