八角形面积计算程序-yiteyi-C++库

正八角形是一个封闭的图形，其边长相同，内角大小相同。它有八条反射对称线和八阶旋转对称线。正八边形每个顶点的内角为135°。中心角为45°。 属性：

null

凸多边形，等边多边形，等边形，等腰形，循环形。

图片[1]-八角形面积计算程序-yiteyi-C++库

公式：

Area : 2 × (side length)² × (1+sqrt(2))

例如：

Input : side = 3Output : Area of Regular Octagon = 43.4558Input : side = 4Output : Area of Regular Octagon = 77.2548

推荐：请尝试你的方法 {IDE} 首先，在进入解决方案之前。

C++

                         // CPP program to find area of octagon                       
                         #include <bits/stdc++.h>                       
                         using                                     namespace                                     std;                       
           
                         // Utility function                       
                         double                                     areaOctagon(                                     double                                     side)                       
                         {                       
                                                 return                                     (                                     float                                     )(2 * (1 +                                     sqrt                                     (2)) *                       
                                                 side * side);                       
                         }                       
           
                         // Driver Code                       
                         int                                     main()                       
                         {                       
                                                 double                                     side = 4;                       
                                                 cout <<                                     "Area of Regular Octagon = "                       
                                                 << areaOctagon(side) << endl;                       
                                                 return                                     0;                       
                         }                       

JAVA

                         // Java Program to find                       
                         // area of Octagon.                       
                         import                                     java.io.*;                       
           
                         class                                     GFG                       
                         {                       
                                                 // utility function                       
                                                 static                                     double                                     areaOctagon(                                     double                                     side)                       
                                                 {                       
                                                 return                                     (                                     float                                     )(                                     2                                     * (                                     1                                     + Math.sqrt(                                     2                                     ))                       
                                                 * side * side);                       
                                                 }                       
                                   
                                                 // driver code                       
                                                 public                                     static                                     void                                     main(String arg[])                       
                                                 {                       
                                                 double                                     side =                                     4                                     ;                       
                                                 System.out.print(                                     "Area of Regular Octagon = "                       
                                                 + areaOctagon(side));                       
                                                 }                       
                         }                       
           
                         // This code is contributed by Anant Agarwal.                       

Python3

                         # Python3 program to                       
                         # find area of octagon                       
           
                         import                                     math                       
           
                         # Utility function                       
                         def                                     areaOctagon(side):                       
                                                 return                                     (                                     2                                     *                                     (                                     1                                     +                                     (math.sqrt(                                     2                                     )))                                     *                                     side                                     *                                     side)                       
           
                         # Driver function                       
                         side                                     =                                     4                       
                         print                                     (                                     "Area of Regular Octagon ="                                     ,                       
                                                 round                                     (areaOctagon(side),                                     4                                     ))                       
           
                         # This code is contributed                       
                         # by Azkia Anam.                       

C#

                         // C# Program to find                       
                         // area of Octagon.                       
                         using                                     System;                       
           
                         class                                     GFG                       
                         {                       
                                                 // utility function                       
                                                 static                                     double                                     areaOctagon(                                     double                                     side)                       
                                                 {                       
                                                 return                                     (                                     float                                     )(2 * (1 + Math.Sqrt(2))                       
                                                 * side * side);                       
                                                 }                       
                                   
                                                 // Driver code                       
                                                 public                                     static                                     void                                     Main()                       
                                                 {                       
                                                 double                                     side = 4;                       
                                                 Console.WriteLine(                                     "Area of Regular Octagon = "                       
                                                 + areaOctagon(side));                       
                                                 }                       
                         }                       
           
                         // This code is contributed by vt_m.                       

PHP

                         <?php                       
                         // PHP program to find area of octagon                       
           
                         // Utility function                       
                         function                                     areaOctagon(                                     $side                                     )                       
                         {                       
                                                 return                                     (2 * (1 + sqrt(2)) *                       
                                                 $side                                     *                                     $side                                     );                       
                         }                       
           
                         // Driver Code                       
           
                         $side                                     = 4;                       
                         echo                                     (                                     "Area of Regular Octagon = "                                     );                       
                         echo                                     (areaOctagon(                                     $side                                     ));                       
           
                         // This code is contributed by vt_m.                       
                         ?>                       

Javascript

                         <script>                       
           
                         // Javascript program to find area of octagon                       
           
                         // Utility function                       
                         function                                     areaOctagon(side)                       
                         {                       
                                                 return                                     (2 * (1 + Math.sqrt(2)) *                       
                                                 side * side);                       
                         }                       
           
                         // Driver Code                       
                                                 let side = 4;                       
                                                 document.write(                                     "Area of Regular Octagon = "                       
                                                 + areaOctagon(side) +                                     "<br>"                                     );                       
           
                         // This code is contributed by Mayank Tyagi                       
                         </script>                       

输出：

Area of Regular Octagon = 77.2548

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