Below is a sample Java program that reads a number from the keyboard and then displays it on the screen. Use this template to write the following programs. Example program showing simple input and output public class TestExp ( public static void main (String[) args) * Create a Scanner object to read data from the keyboard java.util.Scanner keyboard new java.util.scanner (System.in): double myVar: // declare input variable System.out.println("Enter a number"): myVar keyboard.nextDouble: . // display prompt // get a number from the keyboard system.out.printin ("The number is "myVar) display the number [25 points] Write a program that reads in the length of an edge of a tetrahedron and displays its area, which can be computed from the equation: 2. area edge2 Example: For a tetrahedron whose edge is 5.0, the area is 10.825317547305481