JAVA——第二章2.16

import java.util.Scanner;
public class Hexagon {
    public static void main(String[] args) {
        Scanner input = new Scanner(System.in);
        System.out.println("Enter the length of the side:");
        double s = input.nextDouble();
        double area = ((3*Math.sqrt(3))/2)*s*s;
        System.out.println("The area of the hexagon is " + area);
    }
}