Which tool is used to confirm 90-degree or square corners in masonry work?

The framing square is the correct tool for confirming 90-degree or square corners in masonry work. This tool, also known as a carpenter's square, has two legs that form a right angle, allowing masons to easily check and mark right angles on various surfaces. It is particularly useful in laying out walls and ensuring that corners are square, which is essential for structural integrity and aesthetics in masonry projects.

Using a framing square helps ensure that all masonry units are aligned properly, which contributes to the overall quality and stability of the construction. In addition, this tool can be used for measuring and cutting, providing versatility in masonry tasks alongside its primary function of checking square corners.