abstract

using System;

namespace main
{
    class Picture
    {
        private int i;
        triangle[] elements = new triangle[4];
        public Picture(params string[] files)
        {
            foreach (string elem in files)
            {
                if (elem.Length % 2 == 1)
                {
                    elements[i] = new equilateral(elem, 14);
                    i++;
                }
                else
                {
                    elements[i] = new isosceles(elem, 12, 60, 15);
                    i++;
                }
            }
        }
        public void PrintAllInfo()
        {
            foreach (triangle elem in elements)
            {
                Console.WriteLine(elem.ToString());
                Console.WriteLine("");
            }
        }
    }
    abstract class triangle
    {
        protected short first, second, third, angle;
        protected string name, type;
        public triangle(string _name, short mod)
        {
            third = second = first = mod;
            angle = 60;
            this.name = _name;
            type = "Произвольный";
        }
        public abstract double square();
        public abstract double perimeter();
    }
    class isosceles : triangle
    {
        public isosceles(string _name, short mod, short angle, short second)
            : base(_name, mod)
        {
            {
                type = "Равнобедренный";
                this.angle = angle;
                this.second = second;
                third = (short)Math.Truncate(Math.Sqrt(second * second + first * first - 2 * first * second * Math.Cos(angle)));
            }
        }
        public override string ToString()
        {
            return string.Format("Имя данного треугольника - {0}\nВид треугольника: {1}\nДлины неравных сторон - {2} {3}\nУгол между сторонами - {4}\nПериметр - {5}\nПлощадь - {6}", name, type, first, second, angle, perimeter(), square());
        }
        public override double square()
        {
            double p = first + second + third;
            double s = Math.Sqrt(p * (p - first) * (p - second) * (p - third)) / 4;
            return s;
        }
        public override double perimeter()
        {
            return first + 2 * second;
        }
    }
    class equilateral : triangle
    {
        public equilateral(string _name, short mod)
            : base(_name, mod)
        {
            type = "Равносторонний";
        }
        public override double square()
        {
            return Math.Truncate(Math.Sqrt(3) * Math.Pow(first, 2) / 4);
        }
        public override double perimeter()
        {
            return 3 * second;
        }
        public override string ToString()
        {
            return string.Format("Имя данного треугольника - {0}\nВид треугольника: {1}\nДлины неравных сторон - {2} {3}\nУгол между сторонами - {4}\nПериметр - {5}\nПлощадь - {6}", name, type, first, second, angle, perimeter(), square());
        }
    }
    class main
    {
        static void Main(string[] args)
        {
            Picture GeomFig = new Picture("First", "Second", "Firstt", "Secondd");
            GeomFig.PrintAllInfo();
            Console.ReadKey();
        }
    }
}