Final answer:
The best tool for making multiple bends at the same angle is a template, which allows for consistency and precision. While a ruler is best for measuring length in units such as inches, a template is specifically designed for repetitive tasks involving angles.
Step-by-step explanation:
When making multiple bends at the same angle in materials such as metal or plastic, the tool that is most helpful is a template. A template ensures that each bend is consistent with the others, saving time and increasing precision. Other tools mentioned, such as a protractor or ruler, are helpful for individual measurements but do not provide the same ease for repetitive tasks. A protractor would be used to measure angles, a compass for drawing circles or arcs, and a ruler for measuring distance or straight lines.
When matching a tool to a unit of measurement, a ruler is best when dealing with linear distances in inches, centimeters, or millimeters. For example, drawing a vector with a certain magnitude can be done accurately using a ruler for its length and a protractor for its direction. As per the information provided, the answer for the tool that is most helpful when making multiple bends at the same angle is indeed a template, not a ruler.