🔍 Key Concepts

• Parts of a combination square set (rule head, protractor head, center head) • Typical use of a center head in metalworking and layout work • Difference between checking angles and locating centers

💭 Think About

• Think about what shape the center head is and how it fits against a workpiece. What kind of workpiece would match that shape? • Which task, from the options, would most benefit from a tool that has two 90° faces forming a V-shape? • Ask yourself: when working with round bar or pipe, what layout problem is common, and which tool in a combination square set is designed to solve it?

✅ Before You Answer

• Identify which choice involves round material or center-finding rather than general angle checking • Separate the job of a protractor head (measuring degrees) from the job of a square head (finding right angles) • Confirm which option matches a task usually done on a lathe or layout table before drilling or turning on round stock