Geometers explore symmetries of isosceles triangles by using rigid transformations of the plane. They complete four tasks, including congruence proofs, which illustrate the relationship between congruence and rigid transformations. The...

Now you see it, now you don't. Our moon seems to pull a disappearing act from time to time—but why? Take your seventh grade scientists above and beyond to discover the truth about the moon and the role it plays in Earth's little...

Learners investigate the symmetries of a convex quadrilateral in a collaborative activity. Rigid motion and complements are explored as learners analyze different cases of reflections across a line.

Picture someone's excitement of seeing a horse for the first time. How about a cow? The Columbian Exchange changed life for not only Native Americans, but also for Europeans and the entire world. The second lesson of a 22-part series...

Why would someone need contact lenses that offer UV protection? With a 28-page packet full of instruction and worksheets, students discuss solar radiation and its potential harm to eyes. They make snow goggles similar...

How does an individual take a stand for a principle or belief? what skills are required to do so? What are the challenges and risks in doing so? Class members study examples of individuals engaging in such activities and then identify...

Young scholars have a discussion on how to overcome struggle and create endurance. In this endurance lesson plan, students talk about how they can become winners in life even during hard times and not be discouraged by failures. They...