Index: Ringtoets/Piping/src/Ringtoets.Piping.IO/Calculation/Math2D.cs
===================================================================
diff -u -r2da86d14cee084c7d6bfa52136d387cdcdb0a025 -r602479eb3666493485aee246d56b08958a6fc958
--- Ringtoets/Piping/src/Ringtoets.Piping.IO/Calculation/Math2D.cs	(.../Math2D.cs)	(revision 2da86d14cee084c7d6bfa52136d387cdcdb0a025)
+++ Ringtoets/Piping/src/Ringtoets.Piping.IO/Calculation/Math2D.cs	(.../Math2D.cs)	(revision 602479eb3666493485aee246d56b08958a6fc958)
@@ -1,6 +1,5 @@
 using System;
 using Ringtoets.Piping.Data;
-using Ringtoets.Piping.IO.Properties;
 
 namespace Ringtoets.Piping.IO.Calculation
 {
@@ -14,27 +13,40 @@
         /// </summary>
         public const double EpsilonForComparisons = 1e-8;
 
+        /// <summary>
+        /// Determines the intersection point of a line which passes through the <paramref name="firstPoint"/> and 
+        /// the <paramref name="secondPoint"/>; and a line which passes through the <paramref name="thirdPoint"/>
+        /// and the <paramref name="fourthPoint"/>. When the lines are parallel, then <c>null</c> will be returned,
+        /// as no intersection point exists.
+        /// </summary>
+        /// <param name="firstPoint">A <see cref="Point2D"/> which the first line passes through.</param>
+        /// <param name="secondPoint">Another <see cref="Point2D"/> which the first line passes through.</param>
+        /// <param name="thirdPoint">A <see cref="Point2D"/> which the second line passes through.</param>
+        /// <param name="fourthPoint">Another <see cref="Point2D"/> which the second line passes through.</param>
+        /// <returns>An <see cref="Point2D"/> with coordinates at the point where the lines intersect. Or <c>null</c> when no
+        /// intersection point exists (lines are parallel).</returns>
         /// <remarks>
         /// <para>Taken from: https://www.topcoder.com/community/data-science/data-science-tutorials/geometry-concepts-line-intersection-and-its-applications/ </para>
         /// <para>Based on https://en.wikipedia.org/wiki/Line%E2%80%93line_intersection </para>
         /// </remarks>
-        public static Point2D LineIntersectionWithLine(Point2D firstPoint, Point2D secondPoint, Point2D verticalLineFirstPoint, Point2D verticalLineSecondPoint)
+        public static Point2D LineIntersectionWithLine(Point2D firstPoint, Point2D secondPoint, Point2D thirdPoint, Point2D fourthPoint)
         {
             var aLine = secondPoint.Y - firstPoint.Y;
             var bLine = firstPoint.X - secondPoint.X;
-            var cLine = aLine * firstPoint.X + bLine * firstPoint.Y;
+            var cLine = aLine*firstPoint.X + bLine*firstPoint.Y;
 
-            var aOtherLine = verticalLineSecondPoint.Y - verticalLineFirstPoint.Y;
-            var bOtherLine = verticalLineFirstPoint.X - verticalLineSecondPoint.X;
-            var cOtherLine = aOtherLine * verticalLineFirstPoint.X + bOtherLine * verticalLineFirstPoint.Y;
+            var aOtherLine = fourthPoint.Y - thirdPoint.Y;
+            var bOtherLine = thirdPoint.X - fourthPoint.X;
+            var cOtherLine = aOtherLine*thirdPoint.X + bOtherLine*thirdPoint.Y;
 
-            var determinant = aLine * bOtherLine - aOtherLine * bLine;
+            var determinant = aLine*bOtherLine - aOtherLine*bLine;
             if (Math.Abs(determinant) < EpsilonForComparisons)
             {
                 return null;
             }
 
-            return new Point2D {
+            return new Point2D
+            {
                 X = (bOtherLine*cLine - bLine*cOtherLine)/determinant,
                 Y = (aLine*cOtherLine - aOtherLine*cLine)/determinant
             };