diff --git a/spatialmath/base/graphics.py b/spatialmath/base/graphics.py
index 0fe40431..2ce18dc8 100644
--- a/spatialmath/base/graphics.py
+++ b/spatialmath/base/graphics.py
@@ -1394,9 +1394,9 @@ def plot_cuboid(
             edges = [[0, 1, 3, 2, 0], [4, 5, 7, 6, 4], [0, 4], [1, 5], [3, 7], [2, 6]]
             lines = []
             for edge in edges:
-                E = vertices[:, edge]
-                # ax.plot(E[0], E[1], E[2], **kwargs)
-                lines.append(E.T)
+                for line in zip(edge[:-1], edge[1:]):
+                    E = vertices[:, line]
+                    lines.append(E.T)
             if "color" in kwargs:
                 if "alpha" in kwargs:
                     alpha = kwargs["alpha"]
diff --git a/tests/base/test_symbolic.py b/tests/base/test_symbolic.py
index 3ff26f56..7a503b5b 100644
--- a/tests/base/test_symbolic.py
+++ b/tests/base/test_symbolic.py
@@ -58,26 +58,26 @@ def test_functions(self):
         self.assertTrue(isinstance(sqrt(1.0), float))
 
         x = (theta - 1) * (theta + 1) - theta ** 2
-        self.assertEqual(simplify(x).evalf(), -1)
+        self.assertTrue(math.isclose(simplify(x).evalf(), -1))
 
     @unittest.skipUnless(_symbolics, "sympy required")
     def test_constants(self):
 
         x = zero()
         self.assertTrue(isinstance(x, sp.Expr))
-        self.assertEqual(x.evalf(), 0)
+        self.assertTrue(math.isclose(x.evalf(), 0))
 
         x = one()
         self.assertTrue(isinstance(x, sp.Expr))
-        self.assertEqual(x.evalf(), 1)
+        self.assertTrue(math.isclose(x.evalf(), 1))
 
         x = negative_one()
         self.assertTrue(isinstance(x, sp.Expr))
-        self.assertEqual(x.evalf(), -1)
+        self.assertTrue(math.isclose(x.evalf(), -1))
 
         x = pi()
         self.assertTrue(isinstance(x, sp.Expr))
-        self.assertEqual(x.evalf(), math.pi)
+        self.assertTrue(math.isclose(x.evalf(), math.pi))
 
 
 # ---------------------------------------------------------------------------------------#