Exercise 46 Page 681

Before we begin, recall that a figure in a plane has line symmetry if the figure can be mapped onto itself by a reflection in a line, called a line of symmetry. Let's analyze the given figure.

Now, let's think about if we can draw a line in which the figure can be reflected so it maps onto itself. Unfortunately, there is no line like this for the given figure. Therefore, it has no line symmetry.