C# Sharp Exercises: Find the sum of the interior angles (in degrees) of a given Polygon

Last update on June 24 2025 12:57:25 (UTC/GMT +8 hours)

Sum of Interior Angles in Polygon

Write a C# Sharp program to find the sum of the interior angles (in degrees) of a given polygon. Input the number of straight lines.

From Wikipedia,
In geometry, a polygon is a plane figure that is described by a finite number of straight line segments connected to form a closed polygonal chain or polygonal circuit. The solid plane region, the bounding circuit, or the two together, may be called a Polygon.

Sample Solution:

C# Sharp Code:

using System;

namespace exercises
{
    class Program
    {
        static void Main(string[] args)
        {
            // Asking the user to input the number of straight lines in the polygon
            Console.WriteLine("Input number of straight lines of the polygon:");

            // Reading the input number from the user and converting it to an integer
            int n = Convert.ToInt32(Console.ReadLine());

            // Displaying the sum of the interior angles of the polygon using the 'test' method
            Console.WriteLine("Sum of the interior angles (in degrees) of the said polygon: " + test(n));
        }

        // Method to calculate the sum of interior angles of a polygon
        public static int test(int num)
        {
            // Formula to calculate the sum of interior angles of a polygon
            return 180 * (num - 2);
        }
    }
}

Sample Output:

Input number of straight lines of the polygon:
Sum of the interior angles (in degrees) of the said polygon: -360

Flowchart:

For more Practice: Solve these Related Problems:

Write a C# program to calculate the sum of exterior angles for a given polygon with 'n' sides.
Write a C# program to validate if a polygon with given side lengths can exist and return its interior angle sum.
Write a C# program to return the average interior angle of a polygon based on number of sides.
Write a C# program to compare the sum of interior angles of two different polygons and return the difference.

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