Не находит Point. CS0246. Не могу понять в чем ошибка - C#

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
 
namespace ConsoleApplication7
{
    class Program
    {
        static void Main(string[] args)
        {
            int x = 5, y = -3;
            Point p = new Point(x, y);

        }
    }
}

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
 
namespace ConsoleApplication7
{
    class Triangle
    {
        private int x, y, z;
 
        Point a, b, c;
 
        public Triangle(Point X, Point Y, Point Z)
        {
            a = X;
            b = Y;
            c = Z;
 
            // нахождение длин сторон
            x = (int)System.Math.Sqrt((a.X - b.X) * (a.X - b.X) + (a.Y - b.Y) * (a.Y - b.Y));
            y = (int)System.Math.Sqrt((a.X - c.X) * (a.X - c.X) + (a.Y - c.Y) * (a.Y - c.Y));
            z = (int)System.Math.Sqrt((c.X - b.X) * (c.X - b.X) + (c.Y - b.Y) * (c.Y - b.Y));
        }
        public bool canExist()
        {
            if (x + y > z && x + z > y && y + z > x)
                return true;
            else return false;
        }
        public int FindPerimeter()
        {
            return x + y + z;
        }
        public int FindSquare()
        {
            int sum = (x + y + z) / 2;
 
            return (int)System.Math.Sqrt(sum * (sum - x) * (sum - y) * (sum - z));
        }
 
        public Point A
        {
            get
            {
                return a;
            }
        }
        public Point B
        {
            get
            {
                return b;
            }
        }
        public Point C
        {
            get
            {
                return c;
            }
        }
    }
}