When using the included angle formula, which tool is designated for accuracy in measurement?

The protractor is specifically designed for measuring angles with a high degree of accuracy. Its circular scale allows users to determine the degree of an angle by aligning the angle's arms with the protractor's measurement lines. This makes it an ideal tool for applications requiring precision in angle measurement, such as layout practices in machining and woodworking.

While other tools like the tape measure, caliper, and micrometer are essential for measuring length, depth, and thickness, they are not tailored for angle measurement. The tape measure is great for measuring straight distances, the caliper is used for inside, outside, and depth measurements, and the micrometer provides very precise linear measurements, typically millimeters or inches. However, none of these tools can effectively measure angles like a protractor can, which is why it is the correct answer in this context.