diff --git a/cadquery/cq.py b/cadquery/cq.py
index ba82d31..9ed9d16 100644
--- a/cadquery/cq.py
+++ b/cadquery/cq.py
@@ -1321,10 +1321,8 @@ def threePointArc(self, point1, point2, forConstruction=False):
         """
 
         startPoint = self._findFromPoint(False)
-        if not isinstance(point1, Vector):
-            point1 = self.plane.toWorldCoords(point1)
-        if not isinstance(point2, Vector):
-            point2 = self.plane.toWorldCoords(point2)
+        point1 = self.plane.toWorldCoords(point1)
+        point2 = self.plane.toWorldCoords(point2)
 
         arc = Edge.makeThreePointArc(startPoint, point1, point2)
 
@@ -1800,7 +1798,14 @@ def close(self):
 
             s = Workplane().lineTo(1,0).lineTo(1,1).close().extrude(0.2)
         """
-        self.lineTo(self.ctx.firstPoint.x, self.ctx.firstPoint.y)
+        endPoint = self._findFromPoint(True)
+        startPoint = self.ctx.firstPoint
+
+        # Check if there is a distance between startPoint and endPoint
+        # that is larger than what is considered a numerical error.
+        # If so; add a line segment between endPoint and startPoint
+        if endPoint.sub(startPoint).Length > 1e-6:
+            self.lineTo(self.ctx.firstPoint.x, self.ctx.firstPoint.y)
 
         # Need to reset the first point after closing a wire
         self.ctx.firstPoint=None
diff --git a/tests/TestCadQuery.py b/tests/TestCadQuery.py
index 57d19b1..64cadd0 100644
--- a/tests/TestCadQuery.py
+++ b/tests/TestCadQuery.py
@@ -1605,3 +1605,36 @@ def testExtrude(self):
         self.assertTupleAlmostEquals(delta.toTuple(),
                                      (0.,0.,2.*h),
                                      decimal_places)
+
+    def testClose(self):
+        # Close without endPoint and startPoint coincide.
+        # Create a half-circle
+        a = Workplane(Plane.XY()).sagittaArc((10, 0), 2).close().extrude(2)
+
+        # Close when endPoint and startPoint coincide.
+        # Create a double half-circle
+        b = Workplane(Plane.XY()).sagittaArc((10, 0), 2).sagittaArc((0, 0), 2).close().extrude(2)
+
+        # The b shape shall have twice the volume of the a shape.
+        self.assertAlmostEqual(a.val().wrapped.Volume * 2.0, b.val().wrapped.Volume)
+
+        # Testcase 3 from issue #238
+        thickness = 3.0
+        length = 10.0
+        width = 5.0
+
+        obj1 = Workplane('XY', origin=(0, 0, -thickness / 2)) \
+            .moveTo(length / 2, 0).threePointArc((0, width / 2), (-length / 2, 0)) \
+            .threePointArc((0, -width / 2), (length / 2, 0)) \
+            .close().extrude(thickness)
+
+        os_x = 8.0    # Offset in X
+        os_y = -19.5  # Offset in Y
+
+        obj2 = Workplane('YZ', origin=(os_x, os_y, -thickness / 2)) \
+            .moveTo(os_x + length / 2, os_y).sagittaArc((os_x -length / 2, os_y), width / 2) \
+            .sagittaArc((os_x + length / 2, os_y), width / 2) \
+            .close().extrude(thickness)
+
+        # The obj1 shape shall have the same volume as the obj2 shape.
+        self.assertAlmostEqual(obj1.val().wrapped.Volume, obj2.val().wrapped.Volume)