This lesson establishes the straightedge and compass moves that students will use to perform various constructions. They begin by copying a figure and use that construction to develop an inventory of construction moves. Students build on their previous understanding of a circle as a set of points all equidistant from the center and of a line segment as a set of points on a line with two endpoints.

Students attend to precision when they discuss why straightedge and compass moves communicate geometric information consistently, as opposed to eyeballing (MP6).

If students have ready access to digital materials in class, they can choose to perform all construction activities with the GeoGebra Constructions Tool accessible in the Math Tools or available at https://im612.org/construction-tool.