Lesson 8: Using Technology for Constructions
About this lesson
This lesson is optional.
In this lesson, students who haven't had the opportunity to engage with dynamic geometry technology can learn to use it to make a diagram with digital construction tools that are analogous to a compass and straightedge. Students review constructions they have done on paper and build toward more complex constructions made easier by technology. The work of this lesson connects to upcoming work because students will have the opportunity to use this technology throughout the course. The activity Digital Compass and Straightedge Construction is left open and unstructured intentionally so students have the opportunity to make sense of problems (MP1).
Encourage students who finish an activity early to play, make a composite figure, or recreate a design from a previous lesson.
Lesson overview

8.1 Warmup: How Do Digital Construction Tools Work? (10 minutes)
 Digital applet in this activity

8.2 Activity: Digital Compass and Straightedge Construction (15 minutes)
 Digital applet in this activity

8.3 Activity: More Helpful Digital Tools (10 minutes)
 Digital applet in this activity
 Lesson Synthesis

8.4 Cooldown: Is it a Rectangle? (5 minutes)
 Digital applet in this activity
Learning goals:
 Coordinate (orally) technology tools with paper and pencil tools to construct a diagram.
Learning goals (student facing):
 Let’s use technology to construct a diagram.
Learning targets (student facing):
 I can use technology to help me construct specific diagrams.
Required materials:
 Dynamic geometry software
Required preparation:
 Acquire devices that can run GeoGebra (recommended) or other dynamic geometry technology.
 It is ideal if each pair of students has a device. (The GeoGebra Construction App and Geometry App are available under Math Tools.)
IM Algebra 1, Geometry, Algebra 2 is copyright 2019 Illustrative Mathematics and licensed under the Creative Commons Attribution 4.0 International License (CC BY 4.0).
The Illustrative Mathematics name and logo are not subject to the Creative Commons license and may not be used without the prior and express written consent of Illustrative Mathematics.