AreaMomentOfInertia operator / overload (#710)

* Added operator / overload for AreaMomentOfInertia to get Volume when dividing by length

* Added test case for AreaMomentOfInertia operator / overload

Author: lwestfall

UnitsNet.Tests/CustomCode/AreaMomentOfInertiaTests.cs

@@ -22,6 +22,7 @@
 
 
 using System;
+using Xunit;
 
 namespace UnitsNet.Tests.CustomCode
 {
@@ -38,5 +39,12 @@ public class AreaMomentOfInertiaTests : AreaMomentOfInertiaTestsBase
         protected override double MetersToTheFourthInOneMeterToTheFourth => 1;
 
         protected override double MillimetersToTheFourthInOneMeterToTheFourth => 1e12;
+
+        [Fact]
+        public void AreaMomentOfInertiaDividedByLengthEqualsVolume()
+        {
+            Volume volume = AreaMomentOfInertia.FromMetersToTheFourth(20) / Length.FromMeters(10);
+            Assert.Equal(Volume.FromCubicMeters(2), volume);
+        }
     }
 }

UnitsNet/CustomCode/Quantities/AreaMomentOfInertia.extra.cs

@@ -0,0 +1,16 @@
+// Licensed under MIT No Attribution, see LICENSE file at the root.
+// Copyright 2013 Andreas Gullberg Larsen ([email protected]). Maintained at https://github.com/angularsen/UnitsNet.
+
+using System;
+
+namespace UnitsNet
+{
+    public partial struct AreaMomentOfInertia
+    {
+        /// <summary>Get <see cref="Volume"/> from <see cref="AreaMomentOfInertia"/> divided by <see cref="Length"/>.</summary>
+        public static Volume operator /(AreaMomentOfInertia areaMomentOfInertia, Length length)
+        {
+            return Volume.FromCubicMeters(areaMomentOfInertia.MetersToTheFourth / length.Meters);
+        }
+    }
+}