Check if a position is inside the bounds of a rectangle. O(1)

IsAValidPosition.cs

    using static System.Console;

    public class Rectangle
    {
        public Rectangle(int width, int heigth, (int x, int y) lowestPosition)
        {
            Width = width;
            Heigth = heigth;
            LowestPosition = lowestPosition;
        }

        public int Width { get; }
        public int Heigth { get; }
        public (int x, int y) LowestPosition { get; }

        public bool IsThisAValidPosition((int x, int y) position) => 
               position.x >= LowestPosition.x &&
               position.x <= LowestPosition.x + Width &&
               position.y >= LowestPosition.y &&
               position.y <= LowestPosition.y + Heigth;

    }

    class Program
    {
        static void Main()
        {
            var rec = new Rectangle(3, 3, (1, 1));
            var position1 = (4, 4);
            var position2 = (0, 0);
            var position3 = (1, 1);
            var position4 = (2, 3);
            var position5 = (3, 5);

            WriteLine(rec.IsThisAValidPosition(position1)); //True
            WriteLine(rec.IsThisAValidPosition(position2)); //False
            WriteLine(rec.IsThisAValidPosition(position3)); //True
            WriteLine(rec.IsThisAValidPosition(position4)); //True
            WriteLine(rec.IsThisAValidPosition(position5)); //False
        }
    }

IsAValidPosition2.cs

    using static System.Console;
    public class Rectangle
    {
        public Rectangle(int width, int heigth, Position lowestPosition)
        {
            Width = width;
            Heigth = heigth;
            LowestPosition = lowestPosition;
        }

        public int Width { get; }
        public int Heigth { get; }
        public Position LowestPosition { get; }

        public bool IsThisAValidPosition(Position position)
        {
            var (x, y) = position;
            var (lowerX, lowerY) = LowestPosition;

            return 
               x >= lowerX &&
               x <= lowerX + Width &&
               y >= lowerY &&
               y <= lowerY + Heigth;
        }

        public class Position
        {
            (int x, int y) Coords { get; }

            public Position(int x, int y) =>
                Coords = (x, y);

            public void Deconstruct(out int x, out int y) => (x, y) = Coords;
        }
    }

    class Program
    {
        static void Main(string[] args)
        {
            var rec = new Rectangle(3, 3, new Rectangle.Position(1, 1));
            var position1 = new Rectangle.Position(4, 4);
            var position2 = new Rectangle.Position(0, 0);
            var position3 = new Rectangle.Position(1, 1);
            var position4 = new Rectangle.Position(2, 3);
            var position5 = new Rectangle.Position(3, 5);

            WriteLine(rec.IsThisAValidPosition(position1)); //True
            WriteLine(rec.IsThisAValidPosition(position2)); //False
            WriteLine(rec.IsThisAValidPosition(position3)); //True
            WriteLine(rec.IsThisAValidPosition(position4)); //True
            WriteLine(rec.IsThisAValidPosition(position5)); //False
        }
    }