public static void Main()
{
var scaledRectangle = new Size(5, 10);
var scaledRectangleSize = Size.GetRotatedSize(scaledRectangle, 45);
Console.WriteLine(scaledRectangleSize);
}
public static Size GetRotatedSize(Size size, double rotationAngle)
{
var cosOfRotationAgle = Math.Cos(rotationAngle);
var sinOfRotationAngle = Math.Sin(rotationAngle);
var absOfCos = Math.Abs(cosOfRotationAgle);
var absOfSin = Math.Abs(sinOfRotationAngle);
var result = new Size((absOfCos * size.width) + (absOfSin * size.height), (absOfSin * size.width) + (absOfCos * size.height));
return result;
}