2.1 Math

        static void Main(string[] args)
        {

            int squareEdge = 2;
            int rectangleSmallEdge = 3;
            int rectangleBigEdge = 5;
            int Radius = 3;

            double squareArea = Math.Pow(squareEdge, 2);
            double rectangleArea = rectangleSmallEdge * rectangleBigEdge;
            double circleArea = Math.Pow(Radius, 2) * Math.PI;

            Console.WriteLine("Площадь квадрата: " + squareArea);
            Console.WriteLine("Площадь прямоугольника: " + rectangleArea);
            Console.WriteLine("Площадь круга: " + circleArea);




        }