What tool is commonly used for measuring straight or curved distances?

The tape rule, often referred to as a tape measure, is specifically designed for measuring both straight and curved distances. Its flexible, retractable design allows it to contour around objects, making it versatile for a variety of tasks. Unlike rigid measuring tools, the tape rule can easily wrap around curves or irregular shapes, which significantly enhances its usability in fields such as construction, woodworking, and sewing.

In practical applications, the tape rule often features marked measurements in both standard and metric units, providing accuracy regardless of the measuring context. This adaptability is vital when working with projects that involve both straight lines and curves, ensuring precision in acquiring measurements. Its easy portability and ability to extend further than fixed-length tools like rulers also contribute to its popularity and effectiveness as a measuring tool.

The other options have distinct measuring capabilities but do not fulfill the same broad range of applications. For instance, calipers are more suited for measuring internal and external dimensions as well as depths rather than extended distances, while rulers are typically limited to straight measurements and lack flexibility.