3) Write a Java program with a class called Triangle. Develop an overloaded method boolean isPythagorean(a, b, c) which computes the expression if (e=a+b) return true; else return false; for two cases of the parameters a, b, c: int and double. 4) Write a Java program with the following features: [10 points] One class called Radio with attributes: Channel (String), OnOrOff (boolean), Manufacturer (String) and [30 points] Volume (int). a) Insert a list of Radios (two to three) from the keyboard and serialize them in a file called Radio List. b) Read the list of radios from the file and print them on the screen.