Definition
A "set square" is a flat, triangular drawing tool used for creating accurate right angles and other specific angles, like 30, 45, 60, or 90 degrees. It's basically a precise, rigid triangle. Think of it as the protractor's simpler, more straightforward cousin. It's used in technical drawing, drafting, and geometry to ensure lines are perfectly perpendicular or at consistent angles. Unlike a protractor, it doesn't measure arbitrary angles; it provides pre-defined, accurate angles. It is a reliable tool for precision.