NCCER Handtools Practice Test

A fixed 90/45-degree triangle used for layout checks and straight edge work is the speed square. It’s a compact, rigid triangular tool with a 90-degree corner and built-in 45-degree markings, plus straight edges along the sides. That combination lets you quickly verify perpendicular lines and 45-degree angles, mark or guide cuts, and use the edge as a straight stop for scribing lines. The framing square, while also used for right-angle work, is an L-shaped ruler rather than a fixed 90/45 triangle, so it’s not as convenient for quick 45-degree checks on small pieces. The combination square is adjustable, so its angles aren’t fixed, and a carpenter’s square is typically another name for the framing square. So for a fixed 90/45-degree triangle used for layout checks and straight edge work, the speed square is the tool that fits best.