#3 - High School Math

Lesson Title: Sum of the interior angles of a triangle

Level: 10th Grade (Geometry)

Stage: 2 - Adoption

Discussion: Although this lesson sounds very much like it's student-centered, it's still very teacher-directed, with only a specific discovery objective. It utilizes only a small bit of the capability of this software. Still, it's certainly higher than Stage 2.

Enhancements:

• If the students were not told what they must discover, it might qualify as a Stage 4 lesson. For example, they could be assigned to groups, told to discover as much as they could about the interior and exterior angles of triangles, and to justify their conclusions. This would place the lesson firmly in Stage 4.
• As before, specifying Geometer's Sketchpad as the tool of choice takes this exercise out of the running for Stage 5. In the pursuit of triangles' angles at this level, making a variety of tools available - from compasses and straightedges to Internet resources to several possible software packages - and allowing the students to choose the tool they wanted to use, would do the trick.