Add operators for ReciprocalLength/-Area (#1382)

Added additional operators that result in `ReciprocalLength`
(Length/Area, Area/Volume) and `ReciprocalArea` (Length/Volume)

Co-authored-by: Travis Bement <[email protected]>

Author: trb5016

UnitsNet.Tests/CustomCode/AreaTests.cs

@@ -45,6 +45,13 @@ public void AreaDividedByLengthEqualsLength()
             Assert.Equal(length, Length.FromMeters(10));
         }
 
+        [Fact]
+        public void AreaDividedByVolumeEqualsReciprocalLength()
+        {
+            ReciprocalLength reciprocalLength = Area.FromSquareMeters(50) / Volume.FromCubicMeters(5);
+            Assert.Equal(reciprocalLength, ReciprocalLength.FromInverseMeters(10));
+        }
+
         [Fact]
         public void AreaTimesMassFluxEqualsMassFlow()
         {

UnitsNet.Tests/CustomCode/LengthTests.cs

@@ -134,6 +134,20 @@ public void LengthDividedBySpeedEqualsDuration()
             Assert.Equal(Duration.FromSeconds(10), duration);
         }
 
+        [Fact]
+        public void LengthDividedByAreaEqualsReciprocalLength()
+        {
+            ReciprocalLength reciprocalLength = Length.FromMeters(20) / Area.FromSquareMeters(2);
+            Assert.Equal(ReciprocalLength.FromInverseMeters(10), reciprocalLength);
+        }
+
+        [Fact]
+        public void LengthDividedByVolumeEqualsReciprocalArea()
+        {
+            ReciprocalArea reciprocalArea = Length.FromMeters(20) / Volume.FromCubicMeters(2);
+            Assert.Equal(ReciprocalArea.FromInverseSquareMeters(10), reciprocalArea);
+        }
+
         [Fact]
         public void LengthTimesSpeedEqualsKinematicViscosity()
         {

UnitsNet/CustomCode/Quantities/Area.extra.cs

@@ -42,6 +42,12 @@ public ReciprocalArea Inverse()
             return Length.FromMeters(area.SquareMeters / length.Meters);
         }
 
+        /// <summary>Get <see cref="ReciprocalLength"/> from <see cref="Area"/> divided by <see cref="Volume"/>.</summary>
+        public static ReciprocalLength operator /(Area area, Volume volume)
+        {
+            return ReciprocalLength.FromInverseMeters(area.SquareMeters / volume.CubicMeters);
+        }
+
         /// <summary>Get <see cref="MassFlow"/> from <see cref="Area"/> times <see cref="MassFlux"/>.</summary>
         public static MassFlow operator *(Area area, MassFlux massFlux)
         {

UnitsNet/CustomCode/Quantities/Length.extra.cs

@@ -141,6 +141,18 @@ public static bool TryParseFeetInches(string? str, out Length result, IFormatPro
             return Duration.FromSeconds(length.Meters/speed.MetersPerSecond);
         }
 
+        /// <summary>Get <see cref="ReciprocalLength"/> from <see cref="Length"/> divided by <see cref="Area"/>.</summary>
+        public static ReciprocalLength operator /(Length length, Area area)
+        {
+            return ReciprocalLength.FromInverseMeters(length.Meters / area.SquareMeters);
+        }
+
+        /// <summary>Get <see cref="ReciprocalArea"/> from <see cref="Length"/> divided by <see cref="Volume"/>.</summary>
+        public static ReciprocalArea operator /(Length length, Volume volume)
+        {
+            return ReciprocalArea.FromInverseSquareMeters(length.Meters / volume.CubicMeters);
+        }
+
         /// <summary>Get <see cref="Area"/> from <see cref="Length"/> times <see cref="Length"/>.</summary>
         public static Area operator *(Length length1, Length length2)
         {