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  1. /* package whatever; // don't place package name! */
  2.  
  3. import java.util.*;
  4. import java.lang.*;
  5. import java.io.*;
  6.  
  7. /* Name of the class has to be "Main" only if the class is public. */
  8. class Ideone
  9. {
  10. 	public static void main (String[] args) throws java.lang.Exception
  11. 	{
  12. 		RegularPolygon poly = new RegularPolygon(4, 10);
  13.         System.out.println(poly.getr());
  14. 	}
  15.  
  16. 	public static class RegularPolygon {
  17. 	  private int numSides; //# sides
  18. 	  private double sideLength; //side length 
  19. 	  private double inscribedRadius; //radius of inscribed circle
  20.  
  21. 	  public RegularPolygon(int numSides, double sideLength) {
  22. 	    this.numSides = numSides;
  23. 	    this.sideLength = sideLength;
  24. 	    this.calcr();
  25. 	  }
  26.  
  27. 	  private void calcr(){
  28. 	    inscribedRadius = .5 * sideLength * 1/Math.tan(Math.PI / numSides);
  29. 	  }
  30.  
  31. 	  public double getr(){
  32. 	    return inscribedRadius;
  33. 	  }
  34. 	}
  35. }
Success #stdin #stdout 0.08s 380160KB
comments (?)
stdin 
Standard input is empty
stdout 
5.000000000000001
https://ideone.com/lxcmlH
language:
Java (HotSpot 12)
created:
11 years ago
visibility:
public

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