The purpose of this activity is to gain familiarity with dynamic construction tools so students can make constructions using digital technology. The GeoGebra Constructions Tool includes nine construction tools, which can replicate all the moves that can be done with a pencil, straightedge, and compass. There are also five editing tools.

Demonstrate, or invite a student to demonstrate:

• How to use a compass by marking a point and creating a circle centered at that point.
• How to use a straightedge by marking a point on the circle and connecting it to the center to make a radius.

Demonstrate using the polygon tool to make a shape that looks approximately square. Ask students, “Is this a construction of a square?” (No, a construction uses straightedge and compass moves that guarantee everyone will get the same result.) Show how the square can be stretched into another type of quadrilateral by dragging a point. Tell students that in a construction of a square, either a point won’t be possible to drag, or it will maintain the square, only changing the size or orientation. We will call this the “drag test.”