# Java Program to Find Interior and Exterior Angle of Regular Polygon when Number of Sides of Polygon is Given

In the previous article, we have discussed about Java Program to Check if Two Convex Regular Polygon Have Same Center or Not

In this article we are going to see how to find interior and exterior angle of regular polygon by using Java programming language.

## Java Program to Find Interior and Exterior Angle of Regular Polygon when Number of Sides of Polygon is Given

Before Jumping into the program directly let’s see how to find interior and exterior angle of regular polygon.

Explanation:

Suppose there is a polygon N sides

Where N>=3

Now, we need to find the interior and exterior angle of the polygon

Interior angle = (N-2)*180/N

Exterior angle = 360/N

Example:

N = 5

Interior angle = (N-2)*180/N = 108
Exterior angle = 360/N = 72

Let’s see different ways to find interior and exterior angle of regular polygon.

### Method-1: Java Program to Find Interior and Exterior Angle of Regular Polygon By Using Static Value

Approach:

• Declare an int variable say ‘N’ and assign the value to it, which holds the Of sides of N-sided Polygon
• Find the interior and exterior angle using the formula Interior angle = (N-2)*180/N and Exterior angle = 360/N
• Print the result.

Program:

import java.util.*;
public class Main
{
public static void main(String[] args)
{
//number of sides of polygon is declared
int N = 8;
// formula to find the interior and exterior angle of the polygon
int interiorAngle = (N-2)*180/N;
int exteriorAngle = 360/N;
System.out.println("The interior angle of the polygon is " + interiorAngle + " deg");
System.out.println("The exterior angle of the polygon is " + exteriorAngle + " deg");
}
}

Output:

The interior angle of the polygon is 135 deg
The exterior angle of the polygon is 45 deg

### Method-2: Java Program to Find Interior and Exterior Angle of Regular Polygon By Using User Input Value

Approach:

• Declare an int variable say ‘N’ and take the value as user input, it refers to number of sides of N-sided Polygon
• Find the interior and exterior angle using the formula Interior angle = (N-2)*180/N and Exterior angle = 360/N
• Print the result.

Program:

import java.util.*;
public class Main
{
public static void main(String[] args)
{
//Scanner class object created
Scanner s = new Scanner(System.in);
//taking input of number of sides of polygon from user
System.out.println("Enter the no. Of sides of a N-sided polygon");
int N = s.nextInt();

// formula to find the interior and exterior angle of the polygon
int interiorAngle = (N-2)*180/N;
int exteriorAngle = 360/N;
System.out.println("The interior angle of the polygon is " + interiorAngle + " deg");
System.out.println("The exterior angle of the polygon is " + exteriorAngle + " deg");
}
}

Output:

Enter the no. Of sides of a N-sided polygon
6
The interior angle of the polygon is 120 deg
The exterior angle of the polygon is 60 deg

Are you new to the java programming language? We recommend you to ace up your practice session with these Basic Java Programs Examples.

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