What did Aristotle mean by rhetoric is the counterpart to dialectics?

Dialectic was the method of persuasion that Plato used. Dialectic was the foundation of Aristotle's logos (logic). Plato believed that the pure factual truth was the most effective and ethical way to persuade, which is what dialectic was. Dialectic used no distractions such as ethos (creditability) and pathos (emotion). Rhetoric is a counterpart of dialectic because Aristotle's logos is an off-shoot of dialectic.