a) Write a method named octagonArea that prints the area of the octagon: public static void octagonArea (double side) The formula for computing the area of octagon is: Area -2(1+ v2)a, where a represents the side. b) Write a test program that reads the side of an octagon, then calls the above method to print its area. Sample run 1: Enter the side of the octagon: 1 The area of the octagon is Sample run 2: Enter the side of the octagon: 5 The area of the octagon 4.82842712474619 120.71067811865474