public static Size GetRotatedSize(Size size, double angleOfTheFigure)
{
double anglleSinus = Math.Abs(Math.Sign(angleOfTheFigure));
double anglleCosinus = Math.Abs(Math.Cos(angleOfTheFigure));
double width = (anglleCosinus * size.Width) + (anglleSinus * size.Height);
double height = (anglleSinus = size.Width) + (anglleCosinus * size.Width);
Size rotatedSize = new Size(width, height);
return rotatedSize;
}
static void Main(string[] args)
{
Size aaa = new Size(55, 44);
Console.WriteLine(GetRotatedSize(aaa, 123));
}