def test_angle_vector(self):
        v1 = Vector([7.35, 0.221, 5.188])
        v2 = Vector([2.751, 8.259, 3.985])

        response = v1.angle_with(v2, in_degrees=True)

        self.assertEqual(response, 60.264)
    def test_radius_vector(self):
        v1 = Vector([3.183, -7.627])
        v2 = Vector([-2.668, 5.319])

        response = v1.angle_with(v2)

        self.assertEqual(response, 3.078)