6.35(几何:五边形的面积)五边形的面积可以使用下面的公式计算:
编写一个方法,使用下面的方法头来返回五边形的面积。
public static double area(double side)
编写一个主方法,提示用户输入五边形的边,然后显示它的面积。
下面是一个运行示例:
Enter the side:5.5
The area of the pentagon is 52.044441
6.35(Geometry: area of a pentagon)The area of a pentagon can be computed using the following formula:
Write a method that returns the area of a pentagon using the following header:
public static double area(double side)
Write a main method that prompts the user to enter the side of a pentagon and displays its area.
Here is a sample run:
Enter the side:5.5
The area of the pentagon is 52.044441
下面是参考答案代码:
// https://cn.fankuiba.com
import java.util.Scanner;
public class Ans6_35_page205 {
public static void main(String[] args) {
Scanner input = new Scanner(System.in);
System.out.print("Enter the side: ");
double side = input.nextDouble();
System.out.println("The area of the pentagon is "+area(side));
}
public static double area(double side) {
return (5 * side * side) / (4 * Math.tan(Math.PI / 5));
}
}
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