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

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:

Java Code Editor:
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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
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