Device used as tools in projecting or plotting different curves?

• A. Compass
• B. Spline
• C. Protractor
• D. Ruler

Answer: (B)

Drawing smooth, varied curves in maps and diagrams relies on a flexible drafting tool that can be shaped to fit a desired curve. A spline is that tool—a thin, bendable strip that you shape and anchor at fixed points to form a continuous, flowing curve. By adjusting its form, you can create coastlines, contours, or other curved features with precise control over curvature. This flexibility is what sets it apart from the other instruments: a compass is for circles or arcs, a protractor for angles, and a ruler for straight lines. The spline uniquely handles complex curves, making it the best choice for plotting different curves.