# 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 rectangleimport 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`