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Java Exercises: Compute the area of a polygon

Java Basic: Exercise-35 with Solution

Write a Java program to compute the area of a polygon.

Area of a polygon = (n*s^2)/(4*tan(π/n))
where n is n-sided polygon and s is the length of a side.

Test Data:
Input the number of sides on the polygon: 7
Input the length of one of the sides: 6

Pictorial Presentation: Area of Polygon

Java: Compute the area of a polygon

Sample Solution:

Java Code:

import java.util.Scanner;

public class Exercise35 {
    
  public static void main(String[] args) {

        Scanner input = new Scanner(System.in);
        System.out.print("Input the number of sides on the polygon: ");
        int ns = input.nextInt();
        System.out.print("Input the length of one of the sides: ");
        double side = input.nextDouble();
        System.out.print("The area is: " + polygonArea(ns, side)+"\n");
    }
    public static double polygonArea(int ns, double side) {
        return (ns * (side * side)) / (4.0 * Math.tan((Math.PI / ns)));
    }
}

Sample Output: 

Input the number of sides on the polygon: 7                                                                   
Input the length of one of the sides: 6                                                                       
The area is: 130.82084798405722

Flowchart:

Flowchart: Java exercises: Compute the area of a polygon

Java Code Editor:

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Previous: Write a Java program to compute the area of a hexagon.
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Java: Tips of the Day

countOccurrences

Counts the occurrences of a value in an array.

Use Arrays.stream().filter().count() to count total number of values that equals the specified value.

public static long countOccurrences(int[] numbers, int value) {
    return Arrays.stream(numbers)
            .filter(number -> number == value)
            .count();
}

Ref: https://bit.ly/3kCAgLb