How to correct file if I need to use for cicles? circles -- area = ?*radius^2 (f

Question

How to correct file if I need to use for cicles?

circles -- area = ?*radius^2 (format the answer to have two decimal places)?

thank you

import java.util.Scanner;

import java.text.DecimalFormat;

public class Area

{

public static double area(double radius)

{

return (double)?*radius^2 )(radius,2));

}

public static double area(double width,double length)

{

return (width * length);

}

public static double area(double base1,double base2,double height)

{

return (double)((base1 + base2) * height / 2);

}

public static void main(String args[])

{

Scanner in = new Scanner(System.in);

double radius = 3;

double width = 4.0;

double length = 2.0;

double base1 = 3;

double base2 = 4;

double height = 5;

// Create a DecimalFormat object

DecimalFormat fmt = new DecimalFormat("0.0");

//Calculating Area of Circle:

System.out.printf("%.2f ",Area.area(radius));

// Calculating Area of Rectangle:

System.out.println("" + Area.area(width,length));

//Calculating Area of Trapezoid:

System.out.printf("%,.1f " ,Area.area(base1,base2,height));

}

}

Explanation / Answer

Area.java

import java.util.Scanner;

import java.text.DecimalFormat;

public class Area

{

public static double area(double radius)

{

return (double)Math.PI*radius*radius;

}

public static double area(double width,double length)

{

return (width * length);

}

public static double area(double base1,double base2,double height)

{

return (double)((base1 + base2) * height / 2);

}

public static void main(String args[])

{

Scanner in = new Scanner(System.in);

double radius = 3;

double width = 4.0;

double length = 2.0;

double base1 = 3;

double base2 = 4;

double height = 5;

// Create a DecimalFormat object

DecimalFormat fmt = new DecimalFormat("0.0");

//Calculating Area of Circle:

System.out.printf("%.2f ",Area.area(radius));

// Calculating Area of Rectangle:

System.out.println("" + Area.area(width,length));

//Calculating Area of Trapezoid:

System.out.printf("%,.1f " ,Area.area(base1,base2,height));

}

}

Output:

28.27
8.0
17.5

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