Which of the following joints is commonly used for connecting two boards at a right angle?

A half-lap joint is commonly used for connecting two boards at a right angle because it allows for a strong and stable connection. This joint is created by notching out half the thickness of each board at the ends where they will overlap, which results in a flush surface. When the two boards are joined together, the overlapping sections create a larger surface area for adhesive or fasteners, thereby enhancing structural integrity.

This joint is particularly valued in various carpentry applications, such as framing and cabinetry. Its design minimizes the visual disruption of the joint, which can be important in finished projects where aesthetics matter. Additionally, the half-lap joint effectively resists twisting and warping, making it a reliable choice for right-angle connections in woodworking projects.