Final answer:
Maintaining good eye contact with the audience is an effective delivery technique in a formal presentation.
Step-by-step explanation:
An effective delivery technique that Manny used during his formal presentation about a new product to potential customers is maintaining good eye contact with the audience.
Eye contact is important because it establishes a connection with the audience and helps to keep their attention focused on the presenter. When Manny made eye contact, it showed that he was confident and engaged with the audience.
For example, when Manny talked about the benefits of the product, he looked directly at the audience, making sure to make eye contact with different individuals in the room. This made the audience feel included and encouraged them to pay attention to what he was saying.