# Java Program to Find the Perimeter of a Rectangle

A Rectangle is a polygon with four sides where all the internal angles are equal to 90°. In the rectangle, only the opposite sides are equal in length, unlike the square, where all the sides are equal. Suppose one side of the rectangle is 15 cm; its opposite side will also be 15 cm. In the below image, the sides A and C and B and D are equal.

The **perimeter of a rectangle** is defined as the addition of all its sides. Thus, its perimeter can be calculated using the formula below.

Perimeter = A + B + C + D

Since the opposite sides of a rectangle are equal, its perimeter can also be calculated as given below.

Perimeter = A + B + C + D = A + B + A + B = 2A + 2B = 2(A+B)

**Example----**

**Input**

A = 10, B = 5, C = 10, D = 5.

**Output**

The perimeter of the rectangle is 30

**Explanation**

2(A + B) = 2(10 + 5) = 30.

### Implementation

Please go through the example below, where we have implemented a Java program to calculate the perimeter of a rectangle.

**FileName:** RectPerimeter.java

// Java program to calculate the perimeter of a rectangle

import java.util.*;

public class RectPerimeter {

// main method

public static void main(String[] args) {

int a, b, c, d;

int perimeter;

a = c = 10;

b = d = 5;

perimeter = a + b + c + d;

// Another formula

//perimeter = 2 * (a + b);

// Display the perimeter

System.out.println("The perimeter of the given rectangle is " +perimeter);

}

}

**Output:**

The perimeter of the given rectangle is 30