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

IsAValidPosition.cs

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(string[] args)
    {
        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);

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