A straightedge is a tool similar to a ruler, but without markings, used in ruler-and-compass constructions.
An straightedge is used in ruler-and-compass constructions. A straightedge is a tool similar to a ruler, but without markings.
A straightedge is a tool similar to a ruler, but without markings. An straightedge is used in ruler-and-compass constructions.
A straightedge is a tool similar to a ruler, but without markings. An straightedge is used in ruler-and-compass constructions.