And first of all, yes, the thing can indeed be used as a plain ol' ruler, or as a straight edge for drawing lines. It has laser-engraved numerical markings going up to 12 cm along one of its edges ...

We can draw straight lines using a ruler. To position a ruler accurately, place the point that says 0 at the start of the line you are measuring. With the ruler placed carefully on the line ...

This step is the core of drawing a mandala step by step. So follow it carefully. Now use a ruler to draw axes through the ...