What is the purpose of a framing square?

The purpose of a framing square is to ensure precise angles and measurements, making it an essential tool in carpentry. It typically has a right angle and is commonly used to mark and measure right angles in framing structures, which is critical for maintaining the integrity and stability of constructions such as walls and roofs.

In addition to establishing right angles, a framing square also features gradations that help carpenters quickly determine lengths and make accurate measurements, ensuring that every piece fits together as intended. Its ability to verify angles provides a reliable way to ensure that all components of a project are square, which is crucial when constructing anything from simple frames to complex structures.

The other options describe uses for tools that serve different purposes; for example, measuring thickness and creating curves would require tools specifically designed for those tasks, and aligning nails in a straight line can be achieved with different types of layout tools. The framing square, however, stands out as a critical tool for achieving accurate angles and measurements necessary for effective carpentry work.