Added Check in Validator for rectangle having the same points.

Shapes/Triangle.cs

@@ -4,7 +4,31 @@ using System.Drawing;
 
 namespace Shapes
 {
-    public class Triangle
+    public class Triangle : Shape
     {
+        public override Color Fill { get; set; }
+        public override Color Color { get; set; }
+        public override double Width { get; }
+        public override double Height { get; }
+
+        public Triangle(Point point1, Point point2, Point point3)
+        {
+            
+        }
+
+        public Triangle(double x1, double y1, double x2, double y2, double x3, double y3)
+        {
+            
+        }
+        
+        public override double ComputeArea()
+        {
+            throw new NotImplementedException();
+        }
+
+        public override void Scale(double scaleFactor)
+        {
+            throw new NotImplementedException();
+        }
     }
 }