*6.36（幾何：正多邊形的面積）正多邊形是一個n條邊的多邊形，它的每條邊的長度都相等，而且所有角的角度也相等（即多邊形既是等邊又等角的），計算正多邊形面積的公式是：
使用下面的方法頭撰寫方法，回傳正多邊形的面積：
public static double area(int n, double side)
撰寫一個main方法，提示用戶輸入邊的個數以及正多邊形的邊長，然后顯示它的面積，
下面是一個運行示例：
Enter the number of sides: 5
Enter the side:6.5
The area of the polygon is 72.690170
*6.36(Geometry: area of a regular polygon) A regular polygon is an n-sided polygon in which all sides are of the same length and all angles have the same degree (i.e., the polygon is both equilateral and equiangular). The formula for computing the area of a regular polygon is
Write a method that returns the area of a regular polygon using the following header:
public static double area(int n, double side)
Write a main method that prompts the user to enter the number of sides and the side of a regular polygon and displays its area.
Here is a sample run:
Enter the number of sides: 5
Enter the side:6.5
The area of the polygon is 72.690170
下面是參考答案代碼:
// https://cn.fankuiba.com
import java.util.Scanner;
public class Ans6_36_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.print("Enter the number of sides: ");
int n = input.nextInt();
System.out.println("The area of the pentagon is "+area(n,side));
}
public static double area(int n, double side) {
return (n * side * side) / (4 * Math.tan(Math.PI / 5));
}
}
適用Java語言程式設計與資料結構（基礎篇）（原書第11版）Java語言程式設計（基礎篇）（原書第10/11版）更多
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