# Math.atan --- To Degrees Help

• 03-07-2012, 07:42 AM
GregoryNeal
Math.atan --- To Degrees Help
Hi, I've hit a snag. I've got this rather long piece of code that I'm working on, here's the issue area
Code:

```else {                                         //input number of sides and side length                                     int n = Integer.parseInt(d); //number of sides                                         String Ss = JOptionPane.showInputDialog(null, "Enter the length of the side: ", n + "-GON", JOptionPane.QUESTION_MESSAGE);                                         double s = Double.parseDouble(Ss); //side length                                         //calculate area and perimeter ----begin problem area                                         double deg = (Math.toDegrees(180 / n)); //converts radians to degrees                                         double part = Math.atan(deg); //part is a part of the equation that deals with the tangent of some angle (180/n)                                         TotalArea = (((s * s) * n)/ (4 * (part)));                                 System.out.println(TotalArea); //----end problem area                                 }```
I'm trying to convert (180/n) to degrees and then take the tangent of it for use in the equation TotalArea. I've been at it for a solid 30 minutes and just can't get it to work. I'm new to java and this is my first time using any of the Math methods (besides Math.pow). The double "TotalArea" has already been predefined earlier, as well as the String "d".
The program compiles without error, i'm just getting the wrong output.

ps. the code is to calculate the area of an N-sided regular polygon where s is the side length and n is the number of sides, if that helps.