Suggested Activities 1. Make a list of measuring tools and machines with measuring scales in your shop. List the units these tools and scales have (US custom- ary, metric or a combination of both). Are there times when one measurement system is prefer- able to the other? Share this list with your instructor. 2. Lay out an octagon using the octagon scale on a framing square. Show your construction to your instructor. 3. Using an angle divider or T-bevel, divide a 90° angle into 15° increments. Share your drawing with your instructor. 4. Following steps listed in this chapter, lay out a hexagon and an octagon using a compass. Show your finished construction to your instructor. 5. Use the grid method to enlarge a 1/4 scale irregular layout to actual size. Share the fin- ished drawing with your instructor. Copyright Goodheart-Willcox Co., Inc. Chapter 12 Measuring, Marking, and Laying Out Materials 167