多边形的内角和

给定一个整数N ，任务是找到一个N 边多边形的内角和。具有最少三个边和三个角的平面图形称为多边形。
例子：

Input: N = 3 
Output: 180 
3-sided polygon is a triangle and the sum 
of the interior angles of a triangle is 180.
Input: N = 6 
Output: 720 
 

方法： N边多边形的内角和由(N – 2) * 180 给出
下面是上述方法的实现：

C++

// C++ implementation of the approach
#include 
using namespace std;
 
// Function to return the sum of internal
// angles of an n-sided polygon
int sumOfInternalAngles(int n)
{
    if (n < 3)
        return 0;
    return (n - 2) * 180;
}
 
// Driver code
int main()
{
    int n = 5;
 
    cout << sumOfInternalAngles(n);
 
    return 0;
}

Java

// Java implementation of the approach
class GFG {
 
    // Function to return the sum of internal
    // angles of an n-sided polygon
    static int sumOfInternalAngles(int n)
    {
        if (n < 3)
            return 0;
        return ((n - 2) * 180);
    }
 
    // Driver code
    public static void main(String args[])
    {
        int n = 5;
 
        System.out.print(sumOfInternalAngles(n));
    }
}

C#

// C# implementation of the approach
using System;
class GFG {
 
    // Function to return the sum of internal
    // angles of an n-sided polygon
    static int sumOfInternalAngles(int n)
    {
        if (n < 3)
            return 0;
        return ((n - 2) * 180);
    }
 
    // Driver code
    public static void Main()
    {
        int n = 5;
 
        Console.Write(sumOfInternalAngles(n));
    }
}

Python

# Python3 implementation of the approach
 
# Function to return the sum of internal
# angles of an n-sided polygon
def sumOfInternalAngles(n):
    if(n < 3):
        return 0
    return ((n - 2) * 180)
 
# Driver code
n = 5
print(sumOfInternalAngles(n))

Javascript

 
// JavaScript implementation of the approach
 
// Function to return the sum of internal
// angles of an n-sided polygon
function sumOfInternalAngles(n)
{
    if (n < 3)
        return 0;
    return (n - 2) * 180;
}
 
// Driver code
 
    let n = 5;
 
    document.write(sumOfInternalAngles(n));
 
 
// This code is contributed by Mayank Tyagi
 

输出：

540

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