Constructions

A construction is a geometric drawing for which only a compass and a straightedge may be used. There are many excellent construction instructions and illustrations here:

Zef Damen Constructions with Ruler and Compass

compass a compass:
for making circles; for transferring the distance between two existing points
compass ruler/straightedge:
used for drawing a line between two existing points; no distance markings will be used; no measurements are allowed