Mathematics Multifunction Plastic 20cm Drawing Geometry Ruler

20cm Primary Scale: Features a crisp, clear 20cm metric scale along the main edge with highly visible, wear-resistant markings for precise linear measurements.

Integrated Rotating Circle Template: The center of the ruler features a built-in rotatable dial with pre-cut holes. This allows users to draw perfect concentric circles of various diameters from $1\text{ cm}$ up to $14\text{ cm}$ without needing a sharp-tipped compass.

Universal Math & Geometry Symbols: Precision-molded with a variety of built-in templates, including a $180^\circ$ protractor, standard function curves, geometric shapes (triangles, squares, hexagons), and coordinate axis markers.

Smooth Glide Parallel Line Slots: Specially designed with horizontal and vertical guide slots that allow you to draw perfectly spaced parallel lines, charts, and 3D wireframe models quickly and cleanly.