Geometry Session 4: Parallel Lines and Circles

In this session, you will use dynamic geometry software to construct figures with given characteristics such as perpendicular segments, parallel segments, and segments that are equal in length. You will also use this software to discover properties of parallel lines and circles. You will look at some formal geometric definitions, but the emphasis will be on the discovery of properties and relationships among geometric figures.

Part A:
Introduction to Geometer's Sketchpad

Part B:
Parallel Lines

Part C:
Circles

Part D:
Thinking with Technology

Homework

For information on required and/or optional materials for this session, see Note 1.

In this session, you will do the following:
•	Learn how to use dynamic geometry software to construct geometric figures and explore their properties
•	Learn about the properties of angles formed when a pair of parallel lines is cut by a transversal
•	Learn to use the properties of circles to make different constructions
•	Consider the advantages and disadvantages of using dynamic software in studying geometry


	Throughout the session you will be prompted to view short video segments. In addition to these excerpts, you may choose to watch the full-length video of this session.


	Previously Introduced:		New in This Session:
	line plane point quadrilateral ray vertex		central angle circle diameter inscribed angle parallel lines radius transversal

Next > Part A: Introduction to Geometer's Sketchpad

Session 4: Index | Notes | Solutions | Video