using System;

​

public class Program

{

    public static void Main()

    {

        //List Things you can do

        Console.WriteLine("pythagorean theorem");

        Console.WriteLine("area of a circle");

        Console.WriteLine("circumference");

        Console.WriteLine("square root");

        Console.WriteLine("area of a semicircle");

        Console.WriteLine("area of a trapizoid");

        Console.WriteLine("percent of a number");

        Console.WriteLine("---------------------------------");

        Console.WriteLine("Above are the listed formulas.");

        Console.Write("What math formula do you want to use: ");

        string formula;

        formula = Console.ReadLine();

        if(formula == "percent of a number")

        {

            PerNum();

        }

        if(formula == "area of a trapizoid")

        {

            TrAr();

        }

        if (formula == "pythagorean theorem")

        {

            PaTh();

        }

        else if (formula == "area of a semicircle")

        {

            Circles3();

        }

        else if (formula == "area of a circle")

        {

            Circles2();

        }

        else if (formula == "circumference")

        {

            Circles();

        }

        else if (formula == "square root")

        {

            Sqrt();

        }

​

    }

    public static void TrAr()

    {

        double B1;

        double B2;

        double height;

        double area;

        Console.Write("Insert the height of the trapizoid: ");

        height = Convert.ToDouble(Console.ReadLine());

        Console.Write("Insert the top length of the trapizoid: ");

        B1 = Convert.ToDouble(Console.ReadLine());

        Console.Write("Insert the top length of the trapizoid: ");

        B2 = Convert.ToDouble(Console.ReadLine());

        area = (B1+B2)*height/2;

        Console.WriteLine("The area of your trapizoid is "+area);

    }

    public static void PerNum()

    {

        double num01;

        double num02;

        double percent;

        Console.Write("What number do you want to find a percent of: ");

        num01 = Convert.ToDouble(Console.ReadLine());

        Console.Write("What percent of that number do you want to find: ");

        percent = Convert.ToDouble(Console.ReadLine());

        num02 = num01 * (percent/100);

        Console.WriteLine(percent+"% of "+num01+" is " + num02);

​

    }

    public static void Circles3()

    {

        double raid;

        double Area;

        Console.Write("What is the radius of the semicircle: ");

        raid = Convert.ToDouble(Console.ReadLine());

        Area = ((raid * raid) * 3.14)/2;

        Console.Write("The Area of your semicircle is: " + Area);

    }

    public static void Sqrt()

    {

        double int01;

        Console.Write("What number do you want to get the square root of: ");

        int01 = Convert.ToDouble(Console.ReadLine());

        double int02 = Math.Sqrt(int01);

        Console.Write("The square root of " + int01 + " is " + int02);

    }

​

    public static void Circles()

    {

        double Cir;

        double Dia;

        Console.Write("What is the Diameter of the circle: ");

        Dia = Convert.ToDouble(Console.ReadLine());

        Cir = Dia * 3.14;

        Console.WriteLine("The Circumference is " + Cir);

    }

​

    public static void Circles2()

    {

        double raid;

        double Area;

        Console.Write("What is the radius of the circle: ");

        raid = Convert.ToDouble(Console.ReadLine());

        Area = (raid * raid) * 3.14;

        Console.Write("The Area of your circle is: " + Area);

    }

​

    public static void PaTh()

    {

        double num01;

        double num02;

        double hy;

        int solve;

        Console.Write("What side length do you want to solve for(answer 1 for side length and 2 for hypotenuse): ");

        solve = Convert.ToInt32(Console.ReadLine());

        if (solve == 1)

        {

            Console.Write("Input Side length 1: ");

            num01 = Convert.ToDouble(Console.ReadLine());

            Console.Write("Input Hypotenuse Length: ");

            hy = Convert.ToDouble(Console.ReadLine());

            num02 = Math.Sqrt((hy * hy) - (num01 * num01));

            Console.WriteLine("The side Length is: " + num02);

        }

        else if (solve == 2)

        {

            Console.Write("Input Side length 1: ");

            num01 = Convert.ToDouble(Console.ReadLine());

            Console.Write("Input side Length 2: ");

            num02 = Convert.ToDouble(Console.ReadLine());

            hy = Math.Sqrt((num02 * num02) + (num01 * num01));

            Console.WriteLine("The hypotenuse Length is: " + hy);

        }

    }

}