In the figure below, $\mathrm{C}$ is the midpoint of $\overline{\mathrm{EA}}, \Varangle \mathrm{E}$ and $\Varangle \mathrm{A}$ are right angles, and $\mathrm{x} \mathrm{PCE}$
and $\Varangle \mathrm{ACN}$ are vertical angles.
(FIGURE CANT COPY)
Why is $\angle \mathrm{PCE}=\angle \mathrm{ACN} ?$