Java Program to Find the Perimeter of a Rectangle

A Rectangle is a quadrilateral with four right angles (90°). In a rectangle, the opposite sides are equal. A rectangle with all four sides equal is called a Square. A rectangle can also be called as right angled parallelogram.

Rectangle

In the above rectangle, the sides A and C are equal and B and D are equal.

The perimeter of a rectangle is the total length of all its four sides. It can be simply calculated by all its four sides.

Perimeter of rectangle ABCD = A+B+C+D

Since the opposite sides are equal in a rectangle, it can be calculated as the sum of twice of one of its side and twice of its adjacent side.

Perimeter of rectangle ABCD = 2A + 2B = 2(A+B)

Program

Java

// Java program to find the perimeter of a Rectangle

import java.io.*;

class GFG {

    // Method to calculate the perimeter of the rectangle
    // with given length and breadth
    static void perimeter(int length, int breadth)
    {
        // Calculate the 'perimeter' using the formula
        int perimeter = 2 * (length + breadth);

        System.out.println("The perimeter of the given rectangle of length "
            + length + " and breadth " + breadth + " = "
            + perimeter);
    }

    // Driver method
    public static void main(String[] args)
    {
        // Initialize a variable length that stores length of
        // the given rectangle
        int length = 10;

        // Initialize a variable breadth that stores breadth
        // of the given rectangle
        int breadth = 20;

        // Call the perimeter method on these length and
        // breadth
        perimeter(length, breadth);
    }
}

Output

The perimeter of the given rectangle of length 10 and breadth 20 = 60

Time complexity: O(1)

Auxiliary space: O(1)