Question

How to calculate the area of a pentagon in Java

Answer 1

public class Main {

    static float pentagon_area(float side, float apothem) {
        return 5.0f * (side * apothem) / 2.0f;
    }

    public static void main(String[] args) {
        float side = 5.0f;
        float apothem = 3.0f;

        float area = pentagon_area(side, apothem);

        System.out.printf("Area = %.2f%n", area);
    }
}


/*
run:

Area = 37.50

*/

 

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Answer 2

public class Main {

    public static double area_regular_pentagon(double side) {
        return (1.0 / 4.0) * Math.sqrt(5.0 * (5.0 + 2.0 * Math.sqrt(5.0))) * Math.pow(side, 2);
    }

    public static void main(String[] args) {
        System.out.println(area_regular_pentagon(7.0));
    }
}


/*
run:

84.30339262885938

*/

 

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