using System;

public class Program

{

    public static void Main()

    {

        decimal vWidth;

        decimal vLength;

        decimal vHeight;

        decimal vBase;

        decimal vRadius;

        decimal vA;

        decimal vNum1 = 2;

        Decimal vB;

        Decimal vNum2 = 3.14M;

        Console.WriteLine("Please enter a width");

        vWidth = decimal.Parse(Console.ReadLine());

        Console.WriteLine("Please enter a Length (Trapezium)");

        vLength = decimal.Parse(Console.ReadLine());

        Console.WriteLine("Please enter a Height");

        vHeight = decimal.Parse(Console.ReadLine());

        Console.WriteLine("Please enter a base");

        vBase = decimal.Parse(Console.ReadLine());

        Console.WriteLine("Please enter a radius");

        vRadius = decimal.Parse(Console.ReadLine());

        Console.WriteLine("Please enter a number");

        vA = decimal.Parse(Console.ReadLine());

        Console.WriteLine("Please enter another number");

        vB = decimal.Parse(Console.ReadLine());

        vWidth = vBase * vHeight / vNum1;

        Console.WriteLine(" The area of a triangle is " + vWidth);

        vA = vA * vA;

        Console.WriteLine(" The area of a square is " + vA );

        vHeight = vWidth * vHeight;

        Console.WriteLine(" The area of a rectangle is " + vHeight);

        vBase = vBase * vHeight;

        Console.WriteLine(" The area of paralellogram is " + vBase);

        vB = vA + vB * vHeight / vNum1;

        Console.WriteLine(" The area of a trapezium is " + vB);

        vNum2 = vNum2 * vRadius * vRadius;

        Console.WriteLine(" The area of a circle is " + vNum2);

    }

}